1
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Xu Q, Cheung HFH, Cormode DS, Puel TO, Pal S, Yusuf H, Chilcote M, Flatté ME, Johnston‐Halperin E, Fuchs GD. Strong Photon-Magnon Coupling Using a Lithographically Defined Organic Ferrimagnet. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2024; 11:e2310032. [PMID: 38279583 PMCID: PMC11005739 DOI: 10.1002/advs.202310032] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/2023] [Indexed: 01/28/2024]
Abstract
A cavity-magnonic system composed of a superconducting microwave resonator coupled to a magnon mode hosted by the organic-based ferrimagnet vanadium tetracyanoethylene (V[TCNE]x) is demonstrated. This work is motivated by the challenge of scalably integrating a low-damping magnetic system with planar superconducting circuits. V[TCNE]x has ultra-low intrinsic damping, can be grown at low processing temperatures on arbitrary substrates, and can be patterned via electron beam lithography. The devices operate in the strong coupling regime, with a cooperativity exceeding 1000 for coupling between the Kittel mode and the resonator mode at T≈0.4 K, suitable for scalable quantum circuit integration. Higher-order magnon modes are also observed with much narrower linewidths than the Kittel mode. This work paves the way for high-cooperativity hybrid quantum devices in which magnonic circuits can be designed and fabricated as easily as electrical wires.
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Affiliation(s)
- Qin Xu
- Department of PhysicsCornell UniversityIthacaNY14853USA
| | | | | | - Tharnier O. Puel
- Department of Physics and AstronomyUniversity of IowaIowa CityIA52242USA
| | - Srishti Pal
- School of Applied and Engineering PhysicsCornell UniversityIthacaNY14853USA
| | - Huma Yusuf
- Department of PhysicsThe Ohio State UniversityColumbusOH43210USA
| | - Michael Chilcote
- School of Applied and Engineering PhysicsCornell UniversityIthacaNY14853USA
| | - Michael E. Flatté
- Department of Physics and AstronomyUniversity of IowaIowa CityIA52242USA
| | | | - Gregory D. Fuchs
- School of Applied and Engineering PhysicsCornell UniversityIthacaNY14853USA
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2
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Xue JJ, Liu WX, Liang SS, Fang AP, Wang X, Li HR. P T symmetry in a superconducting hybrid quantum system with longitudinal coupling. OPTICS EXPRESS 2023; 31:4580-4598. [PMID: 36785422 DOI: 10.1364/oe.479906] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/08/2022] [Accepted: 01/03/2023] [Indexed: 06/18/2023]
Abstract
We propose a scheme consisting of coupled nanomechanical cantilever resonators and superconducting flux qubits to engineer a parity-time- (P T-) symmetric phononic system formed by active and passive modes. The effective gain (loss) of the phonon mode is achieved by the longitudinal coupling of the resonator and the fast dissipative superconducting qubit with a blue-sideband driving (red-sideband driving). A P T-symmetric to broken-P T-symmetric phase transition can be observed in both balanced gain-to-loss and unbalanced gain-to-loss cases. Applying a resonant weak probe field to the dissipative resonator, we find that (i) for balanced gain and loss, the acoustic signal absorption to amplification can be tuned by changing the coupling strength between resonators; (ii) for unbalanced gain and loss, both acoustically induced transparency and anomalous dispersion can be observed around Δ = 0, where the maximum group delay is also located at this point. Our work provides an experimentally feasible scheme to design P T-symmetric phononic systems and a powerful platform for controllable acoustic signal transmission in a hybrid quantum system.
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3
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Palafox S, Román-Ancheyta R, Çakmak B, Müstecaplıoğlu ÖE. Heat transport and rectification via quantum statistical and coherence asymmetries. Phys Rev E 2022; 106:054114. [PMID: 36559439 DOI: 10.1103/physreve.106.054114] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2022] [Accepted: 10/19/2022] [Indexed: 06/17/2023]
Abstract
Recent experiments at the nanoscales confirm that thermal rectifiers, the thermal equivalent of electrical diodes, can operate in the quantum regime. We present a thorough investigation of the effect of different particle exchange statistics, coherence, and collective interactions on the quantum heat transport of rectifiers with two-terminal junctions. Using a collision model approach to describe the open system dynamics, we obtain a general expression of the nonlinear heat flow that fundamentally deviates from the Landauer formula whenever quantum statistical or coherence asymmetries are present in the bath particles. Building on this, we show that heat rectification is possible even with symmetric medium-bath couplings if the two baths differ in quantum statistics or coherence. Furthermore, the associated thermal conductance vanishes exponentially at low temperatures as in the Coulomb-blockade effect. However, at high temperatures it acquires a power-law behavior depending on the quantum statistics. Our results can be significant for heat management in hybrid open quantum systems or solid-state thermal circuits.
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Affiliation(s)
- Stephania Palafox
- Instituto Nacional de Astrofísica, Óptica y Electrónica, Calle Luis Enrique Erro No.1 Santa María Tonantzintla, Puebla CP 72840, Mexico
| | - Ricardo Román-Ancheyta
- Instituto Nacional de Astrofísica, Óptica y Electrónica, Calle Luis Enrique Erro No.1 Santa María Tonantzintla, Puebla CP 72840, Mexico
| | - Barış Çakmak
- College of Engineering and Natural Sciences, Bahçeşehir University, Beşiktaş, Istanbul 34353, Türkiye
- TUBITAK Research Institute for Fundamental Sciences, 41470 Gebze, Türkiye
| | - Özgür E Müstecaplıoğlu
- TUBITAK Research Institute for Fundamental Sciences, 41470 Gebze, Türkiye
- Department of Physics, Koç University, İstanbul, Sarıyer, 34450, Türkiye
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4
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Ranjan V, Wen Y, Keyser AKV, Kubatkin SE, Danilov AV, Lindström T, Bertet P, de Graaf SE. Spin-Echo Silencing Using a Current-Biased Frequency-Tunable Resonator. PHYSICAL REVIEW LETTERS 2022; 129:180504. [PMID: 36374697 DOI: 10.1103/physrevlett.129.180504] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/09/2022] [Revised: 08/22/2022] [Accepted: 10/06/2022] [Indexed: 06/16/2023]
Abstract
The ability to control microwave emission from a spin ensemble is a requirement of several quantum memory protocols. Here, we demonstrate such ability by using a resonator whose frequency can be rapidly tuned with a bias current. We store excitations in an ensemble of rare-earth ions and suppress on demand the echo emission ("echo silencing") by two methods: (1) detuning the resonator during the spin rephasing, and (2) subjecting spins to magnetic field gradients generated by the bias current itself. We also show that spin coherence is preserved during silencing.
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Affiliation(s)
- V Ranjan
- National Physical Laboratory, Teddington TW11 0LW, United Kingdom
| | - Y Wen
- Université Paris-Saclay, CEA, CNRS, SPEC, 91191 Gif-sur-Yvette Cedex, France
| | - A K V Keyser
- National Physical Laboratory, Teddington TW11 0LW, United Kingdom
- Imperial College London, Exhibition Road, SW7 2AZ, United Kingdom
| | - S E Kubatkin
- Department of Microtechnology and Nanoscience MC2, Chalmers University of Technology, SE-41296 Goteborg, Sweden
| | - A V Danilov
- Department of Microtechnology and Nanoscience MC2, Chalmers University of Technology, SE-41296 Goteborg, Sweden
| | - T Lindström
- National Physical Laboratory, Teddington TW11 0LW, United Kingdom
| | - P Bertet
- Université Paris-Saclay, CEA, CNRS, SPEC, 91191 Gif-sur-Yvette Cedex, France
| | - S E de Graaf
- National Physical Laboratory, Teddington TW11 0LW, United Kingdom
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5
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Matsuzaki Y, Imoto T, Susa Y. Generation of multipartite entanglement between spin-1 particles with bifurcation-based quantum annealing. Sci Rep 2022; 12:14964. [PMID: 36056092 PMCID: PMC9440094 DOI: 10.1038/s41598-022-17621-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2022] [Accepted: 07/28/2022] [Indexed: 11/09/2022] Open
Abstract
Quantum annealing is a way to solve a combinational optimization problem where quantum fluctuation is induced by transverse fields. Recently, a bifurcation-based quantum annealing with spin-1 particles was suggested as another mechanism to implement the quantum annealing. In the bifurcation-based quantum annealing, each spin is initially prepared in [Formula: see text], let this state evolve by a time-dependent Hamiltonian in an adiabatic way, and we find a state spanned by [Formula: see text] at the end of the evolution. Here, we propose a scheme to generate multipartite entanglement, namely GHZ states, between spin-1 particles by using the bifurcation-based quantum annealing. We gradually decrease the detuning of the spin-1 particles while we adiabatically change the amplitude of the external driving fields. Due to the dipole-dipole interactions between the spin-1 particles, we can prepare the GHZ state after performing this protocol. We discuss possible implementations of our scheme by using nitrogen vacancy centers in diamond.
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Affiliation(s)
- Yuichiro Matsuzaki
- Research Center for Emerging Computing Technologies, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Umezono, Tsukuba, Ibaraki, 305-8568, Japan. .,NEC-AIST Quantum Technology Cooperative Research Laboratory, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki, 305-8568, Japan.
| | - Takashi Imoto
- Research Center for Emerging Computing Technologies, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Umezono, Tsukuba, Ibaraki, 305-8568, Japan
| | - Yuki Susa
- NEC-AIST Quantum Technology Cooperative Research Laboratory, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki, 305-8568, Japan.,System Platform Research Laboratories, NEC Corporation, Kawasaki, Kanagawa, 211-8666, Japan
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6
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Detecting spins by their fluorescence with a microwave photon counter. Nature 2021; 600:434-438. [PMID: 34912088 DOI: 10.1038/s41586-021-04076-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2021] [Accepted: 09/30/2021] [Indexed: 11/09/2022]
Abstract
Quantum emitters respond to resonant illumination by radiating part of the absorbed energy. A component of this radiation field is phase coherent with the driving tone, whereas another component is incoherent and consists of spontaneously emitted photons, forming the fluorescence signal1. Atoms, molecules and colour centres are routinely detected by their fluorescence at optical frequencies, with important applications in quantum technology2,3 and microscopy4-7. By contrast, electron spins are usually detected by the phase-coherent echoes that they emit in response to microwave driving pulses8. The incoherent part of their radiation-a stream of microwave photons spontaneously emitted upon individual spin relaxation events-has not been observed so far because of the low spin radiative decay rate and of the lack of single microwave photon detectors (SMPDs). Here using superconducting quantum devices, we demonstrate the detection of a small ensemble of donor spins in silicon by their fluorescence at microwave frequencies and millikelvin temperatures. We enhance their radiative decay rate by coupling them to a high-quality-factor and small-mode-volume superconducting resonator9, and we connect the device output to a newly developed SMPD10 based on a superconducting qubit. In addition, we show that the SMPD can be used to detect spin echoes and that standard spin characterization measurements (Rabi nutation and spectroscopy) can be achieved with both echo and fluorescence detection. We discuss the potential of SMPD detection as a method for magnetic resonance spectroscopy of small numbers of spins.
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7
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Bao Z, Wang Z, Wu Y, Li Y, Ma C, Song Y, Zhang H, Duan L. On-Demand Storage and Retrieval of Microwave Photons Using a Superconducting Multiresonator Quantum Memory. PHYSICAL REVIEW LETTERS 2021; 127:010503. [PMID: 34270274 DOI: 10.1103/physrevlett.127.010503] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/21/2021] [Accepted: 06/09/2021] [Indexed: 06/13/2023]
Abstract
We realize on-demand storage and retrieval of weak coherent microwave photon pulses at the single-photon level. A superconducting multiresonator system which is composed of a set of frequency-tunable coplanar waveguide resonators is implemented as the quantum memory. By dynamically tuning the resonant frequencies of the resonators, we achieve tunable memory bandwidth from 10 to 55 MHz, with well preserved phase coherence. We further demonstrate on-demand storage and retrieval of a time-bin flying qubit. This result opens up a prospect to integrate our chip-based quantum memory with the state-of-the-art superconducting quantum circuit technology for quantum information processing.
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Affiliation(s)
- Zenghui Bao
- Center for Quantum Information, Institute for Interdisciplinary Information Sciences, Tsinghua University, Beijing 100084, People's Republic of China
| | - Zhiling Wang
- Center for Quantum Information, Institute for Interdisciplinary Information Sciences, Tsinghua University, Beijing 100084, People's Republic of China
| | - Yukai Wu
- Center for Quantum Information, Institute for Interdisciplinary Information Sciences, Tsinghua University, Beijing 100084, People's Republic of China
| | - Yan Li
- Center for Quantum Information, Institute for Interdisciplinary Information Sciences, Tsinghua University, Beijing 100084, People's Republic of China
| | - Cheng Ma
- Center for Quantum Information, Institute for Interdisciplinary Information Sciences, Tsinghua University, Beijing 100084, People's Republic of China
| | - Yipu Song
- Center for Quantum Information, Institute for Interdisciplinary Information Sciences, Tsinghua University, Beijing 100084, People's Republic of China
| | - Hongyi Zhang
- Center for Quantum Information, Institute for Interdisciplinary Information Sciences, Tsinghua University, Beijing 100084, People's Republic of China
| | - Luming Duan
- Center for Quantum Information, Institute for Interdisciplinary Information Sciences, Tsinghua University, Beijing 100084, People's Republic of China
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8
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Ranjan V, O'Sullivan J, Albertinale E, Albanese B, Chanelière T, Schenkel T, Vion D, Esteve D, Flurin E, Morton JJL, Bertet P. Multimode Storage of Quantum Microwave Fields in Electron Spins over 100 ms. PHYSICAL REVIEW LETTERS 2020; 125:210505. [PMID: 33274991 DOI: 10.1103/physrevlett.125.210505] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/24/2020] [Accepted: 10/19/2020] [Indexed: 06/12/2023]
Abstract
We report long coherence times (up to 300 ms) for near-surface bismuth donor electron spins in silicon coupled to a superconducting microresonator, biased at a clock transition. This enables us to demonstrate the partial absorption of a train of weak microwave fields in the spin ensemble, their storage for 100 ms, and their retrieval, using a Hahn-echo-like protocol. Phase coherence and quantum statistics are preserved in the storage.
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Affiliation(s)
- V Ranjan
- Université Paris-Saclay, CEA, CNRS, SPEC, 91191 Gif-sur-Yvette Cedex, France
| | - J O'Sullivan
- London Centre for Nanotechnology, University College London, London WC1H 0AH, United Kingdom
| | - E Albertinale
- Université Paris-Saclay, CEA, CNRS, SPEC, 91191 Gif-sur-Yvette Cedex, France
| | - B Albanese
- Université Paris-Saclay, CEA, CNRS, SPEC, 91191 Gif-sur-Yvette Cedex, France
| | - T Chanelière
- Université Grenoble Alpes, CNRS, Grenoble INP, Institut Néel, 38000 Grenoble, France
| | - T Schenkel
- Accelerator Technology and Applied Physics Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - D Vion
- Université Paris-Saclay, CEA, CNRS, SPEC, 91191 Gif-sur-Yvette Cedex, France
| | - D Esteve
- Université Paris-Saclay, CEA, CNRS, SPEC, 91191 Gif-sur-Yvette Cedex, France
| | - E Flurin
- Université Paris-Saclay, CEA, CNRS, SPEC, 91191 Gif-sur-Yvette Cedex, France
| | - J J L Morton
- London Centre for Nanotechnology, University College London, London WC1H 0AH, United Kingdom
| | - P Bertet
- Université Paris-Saclay, CEA, CNRS, SPEC, 91191 Gif-sur-Yvette Cedex, France
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9
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Li PB, Zhou Y, Gao WB, Nori F. Enhancing Spin-Phonon and Spin-Spin Interactions Using Linear Resources in a Hybrid Quantum System. PHYSICAL REVIEW LETTERS 2020; 125:153602. [PMID: 33095609 DOI: 10.1103/physrevlett.125.153602] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/12/2019] [Accepted: 09/15/2020] [Indexed: 06/11/2023]
Abstract
Hybrid spin-mechanical setups offer a versatile platform for quantum science and technology, but improving the spin-phonon as well as the spin-spin couplings of such systems remains a crucial challenge. Here, we propose and analyze an experimentally feasible and simple method for exponentially enhancing the spin-phonon and the phonon-mediated spin-spin interactions in a hybrid spin-mechanical setup, using only linear resources. Through modulating the spring constant of the mechanical cantilever with a time-dependent pump, we can acquire a tunable and nonlinear (two-phonon) drive to the mechanical mode, thus amplifying the mechanical zero-point fluctuations and directly enhancing the spin-phonon coupling. This method allows the spin-mechanical system to be driven from the weak-coupling regime to the strong-coupling regime, and even the ultrastrong coupling regime. In the dispersive regime, this method gives rise to a large enhancement of the phonon-mediated spin-spin interactions between distant solid-state spins, typically two orders of magnitude larger than that without modulation. As an example, we show that the proposed scheme can apply to generating entangled states of multiple spins with high fidelities even in the presence of large dissipations.
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Affiliation(s)
- Peng-Bo Li
- MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, Shaanxi Province Key Laboratory of Quantum Information and Quantum Optoelectronic Devices, School of Physics, Xi'an Jiaotong University, Xi'an 710049, China
- Theoretical Quantum Physics Laboratory, RIKEN Cluster for Pioneering Research, Wako-shi, Saitama 351-0198, Japan
| | - Yuan Zhou
- MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, Shaanxi Province Key Laboratory of Quantum Information and Quantum Optoelectronic Devices, School of Physics, Xi'an Jiaotong University, Xi'an 710049, China
- School of Science, Hubei University of Automotive Technology, Shiyan 442002, China
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore
| | - Wei-Bo Gao
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore
| | - Franco Nori
- Theoretical Quantum Physics Laboratory, RIKEN Cluster for Pioneering Research, Wako-shi, Saitama 351-0198, Japan
- Department of Physics, University of Michigan, Ann Arbor, Michigan 48109-1040, USA
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10
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Shiota Y, Taniguchi T, Ishibashi M, Moriyama T, Ono T. Tunable Magnon-Magnon Coupling Mediated by Dynamic Dipolar Interaction in Synthetic Antiferromagnets. PHYSICAL REVIEW LETTERS 2020; 125:017203. [PMID: 32678634 DOI: 10.1103/physrevlett.125.017203] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/18/2020] [Accepted: 06/03/2020] [Indexed: 06/11/2023]
Abstract
We report an experimental observation of magnon-magnon coupling in interlayer exchange coupled synthetic antiferromagnets of FeCoB/Ru/FeCoB layers. An anticrossing gap of spin-wave resonance between acoustic and optic modes appears when the external magnetic field points to the direction tilted from the spin-wave propagation. The magnitude of the gap (i.e., coupling strength) can be controlled by changing the direction of the in-plane magnetic field and also enhanced by increasing the wave number of excited spin waves. We find that the coupling strength under the specified conditions is larger than the dissipation rates of both the resonance modes, indicating that a strong coupling regime is satisfied. A theoretical analysis based on the Landau-Lifshitz equation shows quantitative agreement with the experiments and indicates that the anticrossing gap appears when the exchange symmetry of two magnetizations is broken by the spin-wave excitation.
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Affiliation(s)
- Yoichi Shiota
- Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
| | - Tomohiro Taniguchi
- National Institute of Advanced Industrial Science and Technology (AIST), Spintronic Research Center, Tsukuba, Ibaraki 305-8568, Japan
| | - Mio Ishibashi
- Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
| | - Takahiro Moriyama
- Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
| | - Teruo Ono
- Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
- Center for Spintronics Research Network, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan
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11
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Kageura T, Hideko M, Tsuyuzaki I, Morishita A, Kawano A, Sasama Y, Yamaguchi T, Takano Y, Tachiki M, Ooi S, Hirata K, Arisawa S, Kawarada H. Single-crystalline boron-doped diamond superconducting quantum interference devices with regrowth-induced step edge structure. Sci Rep 2019; 9:15214. [PMID: 31645621 PMCID: PMC6811626 DOI: 10.1038/s41598-019-51596-w] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2019] [Accepted: 09/26/2019] [Indexed: 11/21/2022] Open
Abstract
Superconducting quantum interference devices (SQUIDs) are currently used as magnetic flux detectors with ultra-high sensitivity for various applications such as medical diagnostics and magnetic material microstructure analysis. Single-crystalline superconducting boron-doped diamond is an excellent candidate for fabricating high-performance SQUIDs because of its robustness and high transition temperature, critical current density, and critical field. Here, we propose a fabrication process for a single-crystalline boron-doped diamond Josephson junction with regrowth-induced step edge structure and demonstrate the first operation of a single-crystalline boron-doped diamond SQUID above 2 K. We demonstrate that the step angle is a significant parameter for forming the Josephson junction and that the step angle can be controlled by adjusting the microwave plasma-enhanced chemical vapour deposition conditions of the regrowth layer. The fabricated junction exhibits superconductor-weak superconductor-superconductor-type behaviour without hysteresis and a high critical current density of 5800 A/cm2.
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Affiliation(s)
- Taisuke Kageura
- Faculty of Science & Engineering, Waseda University, 3-4-1, Okubo, Shinjuku-ku, Tokyo, 169-8555, Japan.
| | - Masakuni Hideko
- Faculty of Science & Engineering, Waseda University, 3-4-1, Okubo, Shinjuku-ku, Tokyo, 169-8555, Japan
| | - Ikuto Tsuyuzaki
- Faculty of Science & Engineering, Waseda University, 3-4-1, Okubo, Shinjuku-ku, Tokyo, 169-8555, Japan
| | - Aoi Morishita
- Faculty of Science & Engineering, Waseda University, 3-4-1, Okubo, Shinjuku-ku, Tokyo, 169-8555, Japan
| | - Akihiro Kawano
- Faculty of Science & Engineering, Waseda University, 3-4-1, Okubo, Shinjuku-ku, Tokyo, 169-8555, Japan
| | - Yosuke Sasama
- National Institute for Materials Science, 1-2-1, Sengen, Tsukuba, Ibaraki, 305-0047, Japan
| | - Takahide Yamaguchi
- National Institute for Materials Science, 1-2-1, Sengen, Tsukuba, Ibaraki, 305-0047, Japan
| | - Yoshihiko Takano
- National Institute for Materials Science, 1-2-1, Sengen, Tsukuba, Ibaraki, 305-0047, Japan
| | - Minoru Tachiki
- National Institute for Materials Science, 1-2-1, Sengen, Tsukuba, Ibaraki, 305-0047, Japan
| | - Shuuichi Ooi
- National Institute for Materials Science, 1-2-1, Sengen, Tsukuba, Ibaraki, 305-0047, Japan
| | - Kazuto Hirata
- National Institute for Materials Science, 1-2-1, Sengen, Tsukuba, Ibaraki, 305-0047, Japan
| | - Shunichi Arisawa
- National Institute for Materials Science, 1-2-1, Sengen, Tsukuba, Ibaraki, 305-0047, Japan
| | - Hiroshi Kawarada
- Faculty of Science & Engineering, Waseda University, 3-4-1, Okubo, Shinjuku-ku, Tokyo, 169-8555, Japan.
- The Kagami Memorial Laboratory for Materials Science and Technology, Waseda University, 2-8-26, Nishiwaseda, Shinjuku-ku, Tokyo, 169-0051, Japan.
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12
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Extension of the Coherence Time by Generating MW Dressed States in a Single NV Centre in Diamond. Sci Rep 2019; 9:13318. [PMID: 31527609 PMCID: PMC6746786 DOI: 10.1038/s41598-019-49683-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2019] [Accepted: 07/31/2019] [Indexed: 11/09/2022] Open
Abstract
Nitrogen-vacancy (NV) centres in diamond hold promise in quantum sensing applications. A major interest in them is an enhancement of their sensitivity by the extension of the coherence time (T2). In this report, we experimentally generated more than four dressed states in a single NV centre in diamond based on Autler-Townes splitting (ATS). We also observed the extension of the coherence time to T2 ~ 1.5 ms which is more than two orders of magnitude longer than that of the undressed states. As an example of a quantum application using these results we propose a protocol of quantum sensing, which shows more than an order of magnitude enhancement in the sensitivity.
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13
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Liu T, Zhang Y, Guo BQ, Yu CS, Zhang WN. Creation of superposition of arbitrary states encoded in two high-Q cavities. OPTICS EXPRESS 2019; 27:27168-27182. [PMID: 31674583 DOI: 10.1364/oe.27.027168] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/04/2019] [Accepted: 08/18/2019] [Indexed: 06/10/2023]
Abstract
The principle of superposition is a key ingredient for quantum mechanics. A recent work [Phys. Rev. Lett.116, 110403 (2016)10.1103/PhysRevLett.116.110403] has shown that a quantum adder that deterministically generates a superposition of two unknown states is forbidden. Here we consider the implementation of the probabilistic quantum adder in the 3D cavity-transmon system. Our implementation is based on a three-level superconducting transmon qubit dispersively coupled to two cavities. Numerical simulations show that high-fidelity generation of the superposition of two coherent states is feasible with current circuit QED technology. Our method also works for other physical systems such as two optical cavities coupled to a three-level atom or two nitrogen-vacancy center ensembles interacted with one three-level superconducting flux qubit.
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14
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Liensberger L, Kamra A, Maier-Flaig H, Geprägs S, Erb A, Goennenwein STB, Gross R, Belzig W, Huebl H, Weiler M. Exchange-Enhanced Ultrastrong Magnon-Magnon Coupling in a Compensated Ferrimagnet. PHYSICAL REVIEW LETTERS 2019; 123:117204. [PMID: 31573248 DOI: 10.1103/physrevlett.123.117204] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/25/2019] [Revised: 07/15/2019] [Indexed: 06/10/2023]
Abstract
We experimentally study the spin dynamics in a gadolinium iron garnet single crystal using broadband ferromagnetic resonance. Close to the ferrimagnetic compensation temperature, we observe ultrastrong coupling of clockwise and counterclockwise magnon modes. The magnon-magnon coupling strength reaches almost 40% of the mode frequency and can be tuned by varying the direction of the external magnetic field. We theoretically explain the observed mode coupling as arising from the broken rotational symmetry due to a weak magnetocrystalline anisotropy. The effect of this anisotropy is exchange enhanced around the ferrimagnetic compensation point.
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Affiliation(s)
- Lukas Liensberger
- Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany
- Physik-Department, Technische Universität München, 85748 Garching, Germany
| | - Akashdeep Kamra
- Center for Quantum Spintronics, Department of Physics, Norwegian University of Science and Technology, 7491 Trondheim, Norway
| | - Hannes Maier-Flaig
- Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany
- Physik-Department, Technische Universität München, 85748 Garching, Germany
| | - Stephan Geprägs
- Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany
| | - Andreas Erb
- Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany
| | | | - Rudolf Gross
- Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany
- Physik-Department, Technische Universität München, 85748 Garching, Germany
- Nanosystems Initiative Munich, 80799 Munich, Germany
- Munich Center for Quantum Science and Technology (MCQST), 80799 Munich, Germany
| | - Wolfgang Belzig
- Department of Physics, University of Konstanz, 78457 Konstanz, Germany
| | - Hans Huebl
- Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany
- Physik-Department, Technische Universität München, 85748 Garching, Germany
- Nanosystems Initiative Munich, 80799 Munich, Germany
- Munich Center for Quantum Science and Technology (MCQST), 80799 Munich, Germany
| | - Mathias Weiler
- Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany
- Physik-Department, Technische Universität München, 85748 Garching, Germany
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15
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Li Y, Polakovic T, Wang YL, Xu J, Lendinez S, Zhang Z, Ding J, Khaire T, Saglam H, Divan R, Pearson J, Kwok WK, Xiao Z, Novosad V, Hoffmann A, Zhang W. Strong Coupling between Magnons and Microwave Photons in On-Chip Ferromagnet-Superconductor Thin-Film Devices. PHYSICAL REVIEW LETTERS 2019; 123:107701. [PMID: 31573284 DOI: 10.1103/physrevlett.123.107701] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/25/2019] [Indexed: 06/10/2023]
Abstract
We demonstrate strong magnon-photon coupling of a thin-film Permalloy device fabricated on a coplanar superconducting resonator. A coupling strength of 0.152 GHz and a cooperativity of 68 are found for a 30-nm-thick Permalloy stripe. The coupling strength is tunable by rotating the biasing magnetic field or changing the volume of Permalloy. We also observe an enhancement of magnon-photon coupling in the nonlinear regime of the superconducting resonator, which is attributed to the nucleation of dynamic flux vortices. Our results demonstrate a critical step towards future integrated hybrid systems for quantum magnonics and on-chip coherent information transfer.
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Affiliation(s)
- Yi Li
- Department of Physics, Oakland University, Rochester, Michigan 48309, USA
- Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - Tomas Polakovic
- Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
- Department of Physics, Drexel University, Philadelphia, Pennsylvania 19104, USA
| | - Yong-Lei Wang
- Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
- Research Institute of Superconductor Electronics, School of Electronic Science and Engineering, Nanjing University, 210093, Nanjing, China
| | - Jing Xu
- Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
- Department of Physics, Northern Illinois University, Dekalb, Illinois 60115, USA
| | - Sergi Lendinez
- Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - Zhizhi Zhang
- Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
- School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Junjia Ding
- Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - Trupti Khaire
- Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - Hilal Saglam
- Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
- Department of Physics, Illinois Institute of Technology, Chicago Illinois 60616, USA
| | - Ralu Divan
- Center for Nanoscale Materials, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - John Pearson
- Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - Wai-Kwong Kwok
- Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - Zhili Xiao
- Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
- Department of Physics, Northern Illinois University, Dekalb, Illinois 60115, USA
| | - Valentine Novosad
- Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - Axel Hoffmann
- Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - Wei Zhang
- Department of Physics, Oakland University, Rochester, Michigan 48309, USA
- Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
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16
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Ultra-long coherence times amongst room-temperature solid-state spins. Nat Commun 2019; 10:3766. [PMID: 31462631 PMCID: PMC6713727 DOI: 10.1038/s41467-019-11776-8] [Citation(s) in RCA: 44] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2019] [Accepted: 08/05/2019] [Indexed: 11/09/2022] Open
Abstract
Solid-state single spins are promising resources for quantum sensing, quantum-information processing and quantum networks, because they are compatible with scalable quantum-device engineering. However, the extension of their coherence times proves challenging. Although enrichment of the spin-zero 12C and 28Si isotopes drastically reduces spin-bath decoherence in diamond and silicon, the solid-state environment provides deleterious interactions between the electron spin and the remaining spins of its surrounding. Here we demonstrate, contrary to widespread belief, that an impurity-doped (phosphorus) n-type single-crystal diamond realises remarkably long spin-coherence times. Single electron spins show the longest inhomogeneous spin-dephasing time (\documentclass[12pt]{minimal}
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\begin{document}$$T_2^ \ast \approx 1.5$$\end{document}T2*≈1.5 ms) and Hahn-echo spin-coherence time (T2 ≈ 2.4 ms) ever observed in room-temperature solid-state systems, leading to the best sensitivities. The extension of coherence times in diamond semiconductor may allow for new applications in quantum technology. The coherence times of nitrogen-vacancy centres are key factors influencing their performance in quantum applications. Here the authors show that synthesising phosphorus-doped diamond yields nitrogen-vacancy centres with significantly improved \documentclass[12pt]{minimal}
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\begin{document}$$T_2^ \ast$$\end{document}T2* and T2.
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17
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Hu X. Fast and space-efficient spin sensing. NATURE NANOTECHNOLOGY 2019; 14:735-736. [PMID: 31316155 DOI: 10.1038/s41565-019-0516-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Affiliation(s)
- Xuedong Hu
- Department of Physics, University at Buffalo, SUNY, Buffalo, NY, USA.
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18
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Coherent microwave-photon-mediated coupling between a semiconductor and a superconducting qubit. Nat Commun 2019; 10:3011. [PMID: 31285437 PMCID: PMC6614454 DOI: 10.1038/s41467-019-10798-6] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2019] [Accepted: 05/28/2019] [Indexed: 12/04/2022] Open
Abstract
Semiconductor qubits rely on the control of charge and spin degrees of freedom of electrons or holes confined in quantum dots. They constitute a promising approach to quantum information processing, complementary to superconducting qubits. Here, we demonstrate coherent coupling between a superconducting transmon qubit and a semiconductor double quantum dot (DQD) charge qubit mediated by virtual microwave photon excitations in a tunable high-impedance SQUID array resonator acting as a quantum bus. The transmon-charge qubit coherent coupling rate (~21 MHz) exceeds the linewidth of both the transmon (~0.8 MHz) and the DQD charge qubit (~2.7 MHz). By tuning the qubits into resonance for a controlled amount of time, we observe coherent oscillations between the constituents of this hybrid quantum system. These results enable a new class of experiments exploring the use of two-qubit interactions mediated by microwave photons to create entangled states between semiconductor and superconducting qubits. Hybrid quantum devices combine different platforms with the prospect of exploiting the advantages of each. Scarlino et al. demonstrate strong, coherent coupling between a semiconductor qubit and a superconducting qubit by using a high-impedance superconducting resonator as a quantum bus.
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19
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Maleki Y, Zheltikov AM. Linear entropy of multiqutrit nonorthogonal states. OPTICS EXPRESS 2019; 27:8291-8307. [PMID: 31052650 DOI: 10.1364/oe.27.008291] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/09/2018] [Accepted: 01/21/2019] [Indexed: 06/09/2023]
Abstract
We derive a closed-form analytical expression for the linear entropy of a multipartite qutrit state, providing a quantitative measure for quantum entanglement within the class of n-mode nonorthogonal qutrit states with any n. Conditions for enhanced and maximum quantum entanglement of multipartite qutrit states are identified. The usefulness of the introduced multipartite qutrit states as quantum communication channel resources is analyzed. The Hamiltonians allowing for the generation of multipartite qutrit states can be attained by combining optomechanical cavities with sequences of tunable beam splitters.
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20
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Gangloff DA, Éthier-Majcher G, Lang C, Denning EV, Bodey JH, Jackson DM, Clarke E, Hugues M, Le Gall C, Atatüre M. Quantum interface of an electron and a nuclear ensemble. Science 2019; 364:62-66. [DOI: 10.1126/science.aaw2906] [Citation(s) in RCA: 69] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2018] [Accepted: 02/08/2019] [Indexed: 11/02/2022]
Abstract
Coherent excitation of an ensemble of quantum objects underpins quantum many-body phenomena and offers the opportunity to realize a memory that stores quantum information. Thus far, a deterministic and coherent interface between a spin qubit and such an ensemble has remained elusive. In this study, we first used an electron to cool the mesoscopic nuclear spin ensemble of a semiconductor quantum dot to the nuclear sideband–resolved regime. We then implemented an all-optical approach to access individual quantized electronic-nuclear spin transitions. Lastly, we performed coherent optical rotations of a single collective nuclear spin excitation—a spin wave. These results constitute the building blocks of a dedicated local memory per quantum-dot spin qubit and promise a solid-state platform for quantum-state engineering of isolated many-body systems.
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21
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Wang R, Deacon RS, Sun J, Yao J, Lieber CM, Ishibashi K. Gate Tunable Hole Charge Qubit Formed in a Ge/Si Nanowire Double Quantum Dot Coupled to Microwave Photons. NANO LETTERS 2019; 19:1052-1060. [PMID: 30636426 DOI: 10.1021/acs.nanolett.8b04343] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
A controllable and coherent light-matter interface is an essential element for a scalable quantum information processor. Strong coupling to an on-chip cavity has been accomplished in various electron quantum dot systems, but rarely explored in the hole systems. Here we demonstrate a hybrid architecture comprising a microwave transmission line resonator controllably coupled to a hole charge qubit formed in a Ge/Si core/shell nanowire (NW), which is a natural one-dimensional hole gas with a strong spin-orbit interaction (SOI) and lack of nuclear spin scattering, potentially enabling fast spin manipulation by electric manners and long coherence times. The charge qubit is established in a double quantum dot defined by local electrical gates. Qubit transition energy can be independently tuned by the electrochemical potential difference and the tunnel coupling between the adjacent dots, opening transverse (σ x) and longitudinal (σ z) degrees of freedom for qubit operation and interaction. As the qubit energy is swept across the photon level, the coupling with resonator is thus switched on and off, as detected by resonator transmission spectroscopy. The observed resonance dynamics is replicated by a complete quantum numerical simulation considering an efficient charge dipole-photon coupling with a strength up to 2π × 55 MHz, yielding an estimation of the spin-resonator coupling rate through SOI to be about 10 MHz. The results inspire the future researches on the coherent hole-photon interaction in Ge/Si nanowires.
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Affiliation(s)
- Rui Wang
- Advanced Device Laboratory , RIKEN , Wako , Saitama 351-0198 , Japan
- Department of Physics , Tokyo University of Science , Kagurazaka, Tokyo 162-8601 , Japan
| | - Russell S Deacon
- Advanced Device Laboratory , RIKEN , Wako , Saitama 351-0198 , Japan
- Center for Emergent Matter Science (CEMS) , RIKEN , Wako , Saitama 351-0198 , Japan
| | - Jian Sun
- Advanced Device Laboratory , RIKEN , Wako , Saitama 351-0198 , Japan
- Hunan Key Laboratory of Super Micro-Structure and Ultrafast Process, School of Physics and Electronics , Central South University , Changsha 410083 , China
| | - Jun Yao
- Department of Electrical and Computer Engineering, Institute for Applied Life Sciences , University of Massachusetts , Amherst , Massachusetts 01003 , United States
| | - Charles M Lieber
- Deparment of Chemistry and Chemical Biology , Harvard University , Cambridge , Massachusetts 02138 , United States
- School of Engineering and Applied Sciences , Harvard University , Cambridge , Massachusetts 02138 , United States
| | - Koji Ishibashi
- Advanced Device Laboratory , RIKEN , Wako , Saitama 351-0198 , Japan
- Center for Emergent Matter Science (CEMS) , RIKEN , Wako , Saitama 351-0198 , Japan
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22
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Yan L, Su S, Hou Q, Yang W, Feng M. Macroscopically distinct superposition in a spin ensemble coupled to superconducting flux-qubits. OPTICS EXPRESS 2019; 27:377-390. [PMID: 30696125 DOI: 10.1364/oe.27.000377] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/19/2018] [Accepted: 11/28/2018] [Indexed: 06/09/2023]
Abstract
Large optical nonlinearities can create fancy physics, such as big Schrödinger-cat states and quadrature squeezing. We present the possibility to practically generate macroscopic Schrödinger-cat states, based on a giant Kerr nonlinearity, in a diamond nitrogen-vacancy ensemble interacting with two coupled flux-qubits. The nonlinearity comes from a four-level N-type configuration formed by two coupled flux-qubits under the appropriately driving fields. We discuss the experimental feasibility in the presence of system dissipations using current laboratory technology and our scheme can be easily extended to other ensemble systems.
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23
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Dynamical coupling between a nuclear spin ensemble and electromechanical phonons. Nat Commun 2018; 9:2993. [PMID: 30154466 PMCID: PMC6113237 DOI: 10.1038/s41467-018-05463-3] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2017] [Accepted: 07/09/2018] [Indexed: 11/08/2022] Open
Abstract
Dynamical coupling with high-quality factor resonators is essential in a wide variety of hybrid quantum systems such as circuit quantum electrodynamics and opto/electromechanical systems. Nuclear spins in solids have a long relaxation time and thus have the potential to be implemented into quantum memories and sensors. However, state manipulation of nuclear spins requires high-magnetic fields, which is incompatible with state-of-the-art quantum hybrid systems based on superconducting microwave resonators. Here we investigate an electromechanical resonator whose electrically tunable phonon state imparts a dynamically oscillating strain field to the nuclear spin ensemble located within it. As a consequence of the dynamical strain, we observe both nuclear magnetic resonance (NMR) frequency shifts and NMR sidebands generated by the electromechanical phonons. This prototype system potentially opens up quantum state engineering for nuclear spins, such as coherent coupling between sound and nuclei, and mechanical cooling of solid-state nuclei. Nuclear spins in solids can be implemented into quantum devices but their manipulation usually requires microwave irradiation. Here instead the authors show that they can shift the NMR frequency and drive the nuclear spins into the resolved-sideband regime by using the tunable phonon states from an electromechanical resonator.
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24
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Chen J, Liu C, Liu T, Xiao Y, Xia K, Bauer GEW, Wu M, Yu H. Strong Interlayer Magnon-Magnon Coupling in Magnetic Metal-Insulator Hybrid Nanostructures. PHYSICAL REVIEW LETTERS 2018; 120:217202. [PMID: 29883138 DOI: 10.1103/physrevlett.120.217202] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/02/2017] [Revised: 02/07/2018] [Indexed: 06/08/2023]
Abstract
We observe strong interlayer magnon-magnon coupling in an on-chip nanomagnonic device at room temperature. Ferromagnetic nanowire arrays are integrated on a 20-nm-thick yttrium iron garnet (YIG) thin film strip. Large anticrossing gaps up to 1.58 GHz are observed between the ferromagnetic resonance of the nanowires and the in-plane standing spin waves of the YIG film. Control experiments and simulations reveal that both the interlayer exchange coupling and the dynamical dipolar coupling contribute to the observed anticrossings. The coupling strength is tunable by the magnetic configuration, allowing the coherent control of magnonic devices.
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Affiliation(s)
- Jilei Chen
- Fert Beijing Institute, BDBC, School of Electronic and Information Engineering, Beihang University, Xueyuan Road 37, Beijing 100191, China
| | - Chuanpu Liu
- Fert Beijing Institute, BDBC, School of Electronic and Information Engineering, Beihang University, Xueyuan Road 37, Beijing 100191, China
| | - Tao Liu
- Department of Physics, Colorado State University, Fort Collins, Colorado 80523, USA
| | - Yang Xiao
- Department of Applied Physics, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
| | - Ke Xia
- Department of Physics, Beijing Normal University, Beijing 100875, China
| | - Gerrit E W Bauer
- Institute for Materials Research, WPI-AIMR and CSNR, Tohoku University, Sendai 980-8577, Japan
- Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
| | - Mingzhong Wu
- Department of Physics, Colorado State University, Fort Collins, Colorado 80523, USA
| | - Haiming Yu
- Fert Beijing Institute, BDBC, School of Electronic and Information Engineering, Beihang University, Xueyuan Road 37, Beijing 100191, China
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25
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Raghunandan M, Wrachtrup J, Weimer H. High-Density Quantum Sensing with Dissipative First Order Transitions. PHYSICAL REVIEW LETTERS 2018; 120:150501. [PMID: 29756853 DOI: 10.1103/physrevlett.120.150501] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/22/2017] [Indexed: 06/08/2023]
Abstract
The sensing of external fields using quantum systems is a prime example of an emergent quantum technology. Generically, the sensitivity of a quantum sensor consisting of N independent particles is proportional to sqrt[N]. However, interactions invariably occurring at high densities lead to a breakdown of the assumption of independence between the particles, posing a severe challenge for quantum sensors operating at the nanoscale. Here, we show that interactions in quantum sensors can be transformed from a nuisance into an advantage when strong interactions trigger a dissipative phase transition in an open quantum system. We demonstrate this behavior by analyzing dissipative quantum sensors based upon nitrogen-vacancy defect centers in diamond. Using both a variational method and a numerical simulation of the master equation describing the open quantum many-body system, we establish the existence of a dissipative first order transition that can be used for quantum sensing. We investigate the properties of this phase transition for two- and three-dimensional setups, demonstrating that the transition can be observed using current experimental technology. Finally, we show that quantum sensors based on dissipative phase transitions are particularly robust against imperfections such as disorder or decoherence, with the sensitivity of the sensor not being limited by the T_{2} coherence time of the device. Our results can readily be applied to other applications in quantum sensing and quantum metrology where interactions are currently a limiting factor.
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Affiliation(s)
- Meghana Raghunandan
- Institut für Theoretische Physik, Leibniz Universität Hannover, Appelstraße 2, 30167 Hannover, Germany
| | - Jörg Wrachtrup
- 3. Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany
| | - Hendrik Weimer
- Institut für Theoretische Physik, Leibniz Universität Hannover, Appelstraße 2, 30167 Hannover, Germany
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26
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Liu T, Guo BQ, Yu CS, Zhang WN. One-step implementation of a hybrid Fredkin gate with quantum memories and single superconducting qubit in circuit QED and its applications. OPTICS EXPRESS 2018; 26:4498-4511. [PMID: 29475300 DOI: 10.1364/oe.26.004498] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/22/2017] [Accepted: 02/04/2018] [Indexed: 06/08/2023]
Abstract
In a recent remarkable experiment [Sci. Adv. 2, e1501531 (2016)], a 3-qubit quantum Fredkin (i.e., controlled-SWAP) gate was demonstrated by using linear optics. Here we propose a simple experimental scheme by utilizing the dispersive interaction in superconducting quantum circuit to implement a hybrid Fredkin gate with a superconducting flux qubit as the control qubit and two separated quantum memories as the target qudits. The quantum memories considered here are prepared by the superconducting coplanar waveguide resonators or nitrogen-vacancy center ensembles. In particular, it is shown that this Fredkin gate can be realized using a single-step operation and more importantly, each target qudit can be in an arbitrary state with arbitrary degrees of freedom. Furthermore, we show that this experimental scheme has many potential applications in quantum computation and quantum information processing such as generating arbitrary entangled states (discrete-variable states or continuous-variable states) of the two memories, measuring the fidelity and the entanglement between the two memories. With state-of-the-art circuit QED technology, the numerical simulation is performed to demonstrate that two-memory NOON states, entangled coherent states, and entangled cat states can be efficiently synthesized.
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27
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Zhang FY, Yang CP. Tunable coupling of spin ensembles. OPTICS LETTERS 2018; 43:466-469. [PMID: 29400816 DOI: 10.1364/ol.43.000466] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/09/2017] [Accepted: 12/14/2017] [Indexed: 06/07/2023]
Abstract
Spin ensembles are promising candidates for quantum memory units because they have long coherence time. Controlling the coupling between spin ensembles is necessary and important in quantum information processing. In this Letter, we propose a method to realize tunable coupling between spin ensembles by a superconducting flux qubit acting as a coupler. The resulting coupling can be used to high-fidelity speed up the adiabatic transfer of quantum information.
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28
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Noguchi A, Yamazaki R, Tabuchi Y, Nakamura Y. Qubit-Assisted Transduction for a Detection of Surface Acoustic Waves near the Quantum Limit. PHYSICAL REVIEW LETTERS 2017; 119:180505. [PMID: 29219573 DOI: 10.1103/physrevlett.119.180505] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/24/2017] [Indexed: 06/07/2023]
Abstract
We demonstrate ultrasensitive measurement of fluctuations in a surface-acoustic-wave (SAW) resonator using a hybrid quantum system consisting of the SAW resonator, a microwave (MW) resonator, and a superconducting qubit. The nonlinearity of the driven qubit induces parametric coupling, which up-converts the excitation in the SAW resonator to that in the MW resonator. Thermal fluctuations of the SAW resonator near the quantum limit are observed in the noise spectroscopy in the MW domain.
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Affiliation(s)
- Atsushi Noguchi
- Research Center for Advanced Science and Technology (RCAST), The University of Tokyo, Meguro-ku, Tokyo 153-8904, Japan
- PRESTO, Japan Science and Technology Agency, Kawaguchi-shi, Saitama 332-0012, Japan
| | - Rekishu Yamazaki
- Research Center for Advanced Science and Technology (RCAST), The University of Tokyo, Meguro-ku, Tokyo 153-8904, Japan
- PRESTO, Japan Science and Technology Agency, Kawaguchi-shi, Saitama 332-0012, Japan
| | - Yutaka Tabuchi
- Research Center for Advanced Science and Technology (RCAST), The University of Tokyo, Meguro-ku, Tokyo 153-8904, Japan
| | - Yasunobu Nakamura
- Research Center for Advanced Science and Technology (RCAST), The University of Tokyo, Meguro-ku, Tokyo 153-8904, Japan
- Center for Emergent Matter Science (CEMS), RIKEN, Wako-shi, Saitama 351-0198, Japan
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29
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Cottet A, Dartiailh MC, Desjardins MM, Cubaynes T, Contamin LC, Delbecq M, Viennot JJ, Bruhat LE, Douçot B, Kontos T. Cavity QED with hybrid nanocircuits: from atomic-like physics to condensed matter phenomena. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2017; 29:433002. [PMID: 28925381 DOI: 10.1088/1361-648x/aa7b4d] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Circuit QED techniques have been instrumental in manipulating and probing with exquisite sensitivity the quantum state of superconducting quantum bits coupled to microwave cavities. Recently, it has become possible to fabricate new devices in which the superconducting quantum bits are replaced by hybrid mesoscopic circuits combining nanoconductors and metallic reservoirs. This mesoscopic QED provides a new experimental playground to study the light-matter interaction in electronic circuits. Here, we present the experimental state of the art of mesoscopic QED and its theoretical description. A first class of experiments focuses on the artificial atom limit, where some quasiparticles are trapped in nanocircuit bound states. In this limit, the circuit QED techniques can be used to manipulate and probe electronic degrees of freedom such as confined charges, spins, or Andreev pairs. A second class of experiments uses cavity photons to reveal the dynamics of electron tunneling between a nanoconductor and fermionic reservoirs. For instance, the Kondo effect, the charge relaxation caused by grounded metallic contacts, and the photo-emission caused by voltage-biased reservoirs have been studied. The tunnel coupling between nanoconductors and fermionic reservoirs also enable one to obtain split Cooper pairs, or Majorana bound states. Cavity photons represent a qualitatively new tool to study these exotic condensed matter states.
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Affiliation(s)
- Audrey Cottet
- Laboratoire Pierre Aigrain, Ecole Normale Supérieure, CNRS UMR 8551, Laboratoire associé aux universités Pierre et Marie Curie et Denis Diderot, 24, rue Lhomond, 75231 Paris Cedex 05, France
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30
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Fujiwara M, Neitzke O, Schröder T, Schell AW, Wolters J, Zheng J, Mouradian S, Almoktar M, Takeuchi S, Englund D, Benson O. Fiber-Coupled Diamond Micro-Waveguides toward an Efficient Quantum Interface for Spin Defect Centers. ACS OMEGA 2017; 2:7194-7202. [PMID: 31457298 PMCID: PMC6645309 DOI: 10.1021/acsomega.7b01223] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/22/2017] [Accepted: 10/11/2017] [Indexed: 06/10/2023]
Abstract
We report the direct integration and efficient coupling of nitrogen vacancy (NV) color centers in diamond nanophotonic structures into a fiber-based photonic architecture at cryogenic temperatures. NV centers are embedded in diamond micro-waveguides (μWGs), which are coupled to fiber tapers. Fiber tapers have low-loss connection to single-mode optical fibers and hence enable efficient integration of NV centers into optical fiber networks. We numerically optimize the parameters of the μWG-fiber-taper devices designed particularly for use in cryogenic experiments, resulting in 35.6% coupling efficiency, and experimentally demonstrate cooling of these devices to the liquid helium temperature of 4.2 K without loss of the fiber transmission. We observe sharp zero-phonon lines in the fluorescence of NV centers through the pigtailed fibers at 100 K. The optimized devices with high photon coupling efficiency and the demonstration of cooling to cryogenic temperatures are an important step to realize fiber-based quantum nanophotonic interfaces using diamond spin defect centers.
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Affiliation(s)
- Masazumi Fujiwara
- Institut
für Physik, Humboldt Universität
zu Berlin, Newtonstrasse
15, 12489 Berlin, Germany
- Department
of Chemistry, Osaka City University, 3-3-138 Sugimoto, Sumiyoshi, Osaka 558-8585, Japan
- Research
Institute for Electronic Science, Hokkaido
University, N20W10, Kita-Ward, Sapporo 001-0020, Hokkaido, Japan
- The
Institute of Scientific and Industrial Research, Osaka University, Mihogaoka
8-1, Ibaraki, Osaka 567-0047, Japan
| | - Oliver Neitzke
- Institut
für Physik, Humboldt Universität
zu Berlin, Newtonstrasse
15, 12489 Berlin, Germany
| | - Tim Schröder
- Department
of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
- Niels Bohr
Institute, University of Copenhagen, Blegdamsvej 17, 2100 Copenhagen, Denmark
| | - Andreas W. Schell
- Institut
für Physik, Humboldt Universität
zu Berlin, Newtonstrasse
15, 12489 Berlin, Germany
| | - Janik Wolters
- Institut
für Physik, Humboldt Universität
zu Berlin, Newtonstrasse
15, 12489 Berlin, Germany
| | - Jiabao Zheng
- Department
of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
| | - Sara Mouradian
- Department
of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
| | - Mohamed Almoktar
- Research
Institute for Electronic Science, Hokkaido
University, N20W10, Kita-Ward, Sapporo 001-0020, Hokkaido, Japan
- The
Institute of Scientific and Industrial Research, Osaka University, Mihogaoka
8-1, Ibaraki, Osaka 567-0047, Japan
- Physics
Department, Assiut University, Assiut 71516, Egypt
| | - Shigeki Takeuchi
- Research
Institute for Electronic Science, Hokkaido
University, N20W10, Kita-Ward, Sapporo 001-0020, Hokkaido, Japan
- The
Institute of Scientific and Industrial Research, Osaka University, Mihogaoka
8-1, Ibaraki, Osaka 567-0047, Japan
- Department
of Electronic Science and Engineering, Kyoto
University, Kyoto Daigaku-Katsura, Nishikyo-ku, Kyoto 615-8510, Japan
| | - Dirk Englund
- Department
of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
| | - Oliver Benson
- Institut
für Physik, Humboldt Universität
zu Berlin, Newtonstrasse
15, 12489 Berlin, Germany
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31
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Wendin G. Quantum information processing with superconducting circuits: a review. REPORTS ON PROGRESS IN PHYSICS. PHYSICAL SOCIETY (GREAT BRITAIN) 2017; 80:106001. [PMID: 28682303 DOI: 10.1088/1361-6633/aa7e1a] [Citation(s) in RCA: 107] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
During the last ten years, superconducting circuits have passed from being interesting physical devices to becoming contenders for near-future useful and scalable quantum information processing (QIP). Advanced quantum simulation experiments have been shown with up to nine qubits, while a demonstration of quantum supremacy with fifty qubits is anticipated in just a few years. Quantum supremacy means that the quantum system can no longer be simulated by the most powerful classical supercomputers. Integrated classical-quantum computing systems are already emerging that can be used for software development and experimentation, even via web interfaces. Therefore, the time is ripe for describing some of the recent development of superconducting devices, systems and applications. As such, the discussion of superconducting qubits and circuits is limited to devices that are proven useful for current or near future applications. Consequently, the centre of interest is the practical applications of QIP, such as computation and simulation in Physics and Chemistry.
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Affiliation(s)
- G Wendin
- Department of Microtechnology and Nanoscience-MC2, Chalmers University of Technology, SE-41296 Gothenburg, Sweden
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32
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Lekavicius I, Golter DA, Oo T, Wang H. Transfer of Phase Information between Microwave and Optical Fields via an Electron Spin. PHYSICAL REVIEW LETTERS 2017; 119:063601. [PMID: 28949593 DOI: 10.1103/physrevlett.119.063601] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/24/2017] [Indexed: 06/07/2023]
Abstract
We demonstrate the coherent coupling and the resulting transfer of phase information between microwave and optical fields in a single nitrogen vacancy center in diamond. The relative phase of two microwave fields is encoded in a coherent superposition spin state. This phase information is then retrieved with a pair of optical fields. A related process is also used for the transfer of phase information from optical to microwave fields. These studies show the essential role of dark states, including optical pumping into the dark states, in the coherent microwave-optical coupling and open the door to the full quantum state transfer between microwave and optical fields in a solid-state spin ensemble.
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Affiliation(s)
- Ignas Lekavicius
- Department of Physics, University of Oregon, Eugene, Oregon 97403, USA
| | - D Andrew Golter
- Department of Physics, University of Oregon, Eugene, Oregon 97403, USA
| | - Thein Oo
- Department of Physics, University of Oregon, Eugene, Oregon 97403, USA
| | - Hailin Wang
- Department of Physics, University of Oregon, Eugene, Oregon 97403, USA
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33
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Chou JP, Retzker A, Gali A. Nitrogen-Terminated Diamond (111) Surface for Room-Temperature Quantum Sensing and Simulation. NANO LETTERS 2017; 17:2294-2298. [PMID: 28339209 DOI: 10.1021/acs.nanolett.6b05023] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The nitrogen-vacancy (NV) center in diamond has shown great promise of nanoscale sensing applications, however, near-surface NV suffer from relatively short spin coherence time that limits its sensitivity. This is presumably caused by improper surface termination. Using first-principles calculations, we propose that nitrogen-terminated (111) diamond provides electrical inactivity and surface spin noise free properties. We anticipate that the nitrogen-terminated (111) surface can be fabricated by nitrogen plasma treatment. Our findings pave the way toward an improved NV-based quantum sensing and quantum simulation operating at room temperature.
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Affiliation(s)
- Jyh-Pin Chou
- Institute for Solid State Physics and Optics, Wigner Research Centre for Physics, Hungarian Academy of Sciences , POB 49, Budapest H-1525, Hungary
| | - Alex Retzker
- Racah Institute of Physics, The Hebrew University of Jerusalem , Givat Ram Jerusalem 91904, Israel
| | - Adam Gali
- Institute for Solid State Physics and Optics, Wigner Research Centre for Physics, Hungarian Academy of Sciences , POB 49, Budapest H-1525, Hungary
- Department of Atomic Physics, Budapest University of Technology and Economics , Budafoki út 8, H-1111, Budapest, Hungary
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34
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Das S, Elfving VE, Faez S, Sørensen AS. Interfacing Superconducting Qubits and Single Optical Photons Using Molecules in Waveguides. PHYSICAL REVIEW LETTERS 2017; 118:140501. [PMID: 28430479 DOI: 10.1103/physrevlett.118.140501] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/21/2016] [Indexed: 06/07/2023]
Abstract
We propose an efficient light-matter interface at optical frequencies between a single photon and a superconducting qubit. The desired interface is based on a hybrid architecture composed of an organic molecule embedded inside an optical waveguide and electrically coupled to a superconducting qubit placed near the outside surface of the waveguide. We show that high fidelity, photon-mediated, entanglement between distant superconducting qubits can be achieved with incident pulses at the single photon level. Such a low light level is highly desirable for achieving a coherent optical interface with superconducting qubit, since it minimizes decoherence arising from the absorption of light.
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Affiliation(s)
- Sumanta Das
- Niels Bohr Institute, University of Copenhagen, Blegdamsvej 17, 2100 Copenhagen Ø, Denmark
| | - Vincent E Elfving
- Niels Bohr Institute, University of Copenhagen, Blegdamsvej 17, 2100 Copenhagen Ø, Denmark
| | - Sanli Faez
- Debye Institute for Nanomaterials Science and Center for Extreme Matter and Emergent Phenomena, Utrecht University, 3584 CC Utrecht, Netherlands
| | - Anders S Sørensen
- Niels Bohr Institute, University of Copenhagen, Blegdamsvej 17, 2100 Copenhagen Ø, Denmark
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35
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Eichler C, Sigillito AJ, Lyon SA, Petta JR. Electron Spin Resonance at the Level of 10^{4} Spins Using Low Impedance Superconducting Resonators. PHYSICAL REVIEW LETTERS 2017; 118:037701. [PMID: 28157376 DOI: 10.1103/physrevlett.118.037701] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/18/2016] [Indexed: 05/23/2023]
Abstract
We report on electron spin resonance measurements of phosphorus donors localized in a 200 μm^{2} area below the inductive wire of a lumped element superconducting resonator. By combining quantum limited parametric amplification with a low impedance microwave resonator design, we are able to detect around 2×10^{4} spins with a signal-to-noise ratio of 1 in a single shot. The 150 Hz coupling strength between the resonator field and individual spins is significantly larger than the 1-10 Hz coupling rates obtained with typical coplanar waveguide resonator designs. Because of the larger coupling rate, we find that spin relaxation is dominated by radiative decay into the resonator and dependent upon the spin-resonator detuning, as predicted by Purcell.
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Affiliation(s)
- C Eichler
- Department of Physics, Princeton University, Princeton, New Jersey 08544, USA
| | - A J Sigillito
- Department of Electrical Engineering, Princeton University, Princeton, New Jersey 08544, USA
| | - S A Lyon
- Department of Electrical Engineering, Princeton University, Princeton, New Jersey 08544, USA
| | - J R Petta
- Department of Physics, Princeton University, Princeton, New Jersey 08544, USA
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36
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Kakuyanagi K, Matsuzaki Y, Déprez C, Toida H, Semba K, Yamaguchi H, Munro WJ, Saito S. Observation of Collective Coupling between an Engineered Ensemble of Macroscopic Artificial Atoms and a Superconducting Resonator. PHYSICAL REVIEW LETTERS 2016; 117:210503. [PMID: 27911564 DOI: 10.1103/physrevlett.117.210503] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/23/2016] [Indexed: 06/06/2023]
Abstract
The hybridization of distinct quantum systems is now seen as an effective way to engineer the properties of an entire system leading to applications in quantum metamaterials, quantum simulation, and quantum metrology. Recent improvements in both fabrication techniques and qubit design have allowed the community to consider coupling large ensembles of artificial atoms, such as superconducting qubits, to a resonator. Here, we demonstrate the coherent coupling between a microwave resonator and a macroscopic ensemble composed of several thousand superconducting flux qubits, where we observe a large dispersive frequency shift in the spectrum of 250 MHz. We achieve the large dispersive shift with a collective enhancement of the coupling strength between the resonator and qubits. These results represent the largest number of coupled superconducting qubits realized so far.
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Affiliation(s)
- Kosuke Kakuyanagi
- NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato-Wakamiya, Atsugi, Kanagawa 243-0198, Japan
| | - Yuichiro Matsuzaki
- NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato-Wakamiya, Atsugi, Kanagawa 243-0198, Japan
| | - Corentin Déprez
- NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato-Wakamiya, Atsugi, Kanagawa 243-0198, Japan
| | - Hiraku Toida
- NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato-Wakamiya, Atsugi, Kanagawa 243-0198, Japan
| | - Kouichi Semba
- National Institute of Information and Communications Technology, 4-2-1, Nukuikitamachi, Koganei, Tokyo 184-8795, Japan
| | - Hiroshi Yamaguchi
- NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato-Wakamiya, Atsugi, Kanagawa 243-0198, Japan
| | - William J Munro
- NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato-Wakamiya, Atsugi, Kanagawa 243-0198, Japan
| | - Shiro Saito
- NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato-Wakamiya, Atsugi, Kanagawa 243-0198, Japan
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37
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Heshami K, England DG, Humphreys PC, Bustard PJ, Acosta VM, Nunn J, Sussman BJ. Quantum memories: emerging applications and recent advances. JOURNAL OF MODERN OPTICS 2016; 63:2005-2028. [PMID: 27695198 PMCID: PMC5020357 DOI: 10.1080/09500340.2016.1148212] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/06/2015] [Accepted: 12/27/2015] [Indexed: 05/20/2023]
Abstract
Quantum light-matter interfaces are at the heart of photonic quantum technologies. Quantum memories for photons, where non-classical states of photons are mapped onto stationary matter states and preserved for subsequent retrieval, are technical realizations enabled by exquisite control over interactions between light and matter. The ability of quantum memories to synchronize probabilistic events makes them a key component in quantum repeaters and quantum computation based on linear optics. This critical feature has motivated many groups to dedicate theoretical and experimental research to develop quantum memory devices. In recent years, exciting new applications, and more advanced developments of quantum memories, have proliferated. In this review, we outline some of the emerging applications of quantum memories in optical signal processing, quantum computation and non-linear optics. We review recent experimental and theoretical developments, and their impacts on more advanced photonic quantum technologies based on quantum memories.
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Affiliation(s)
| | | | | | | | - Victor M. Acosta
- Department of Physics and Astronomy, University of New Mexico, Center for High Technology Materials, Albuquerque, NM, USA
| | - Joshua Nunn
- Clarendon Laboratory, University of Oxford, Oxford, UK
| | - Benjamin J. Sussman
- National Research Council of Canada, Ottawa, Canada
- Department of Physics, University of Ottawa, Ottawa, Canada
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38
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Song WL, Yang WL, Yin ZQ, Chen CY, Feng M. Controllable quantum dynamics of inhomogeneous nitrogen-vacancy center ensembles coupled to superconducting resonators. Sci Rep 2016; 6:33271. [PMID: 27627994 PMCID: PMC5024108 DOI: 10.1038/srep33271] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2016] [Accepted: 08/22/2016] [Indexed: 11/09/2022] Open
Abstract
We explore controllable quantum dynamics of a hybrid system, which consists of an array of mutually coupled superconducting resonators (SRs) with each containing a nitrogen-vacancy center spin ensemble (NVE) in the presence of inhomogeneous broadening. We focus on a three-site model, which compared with the two-site case, shows more complicated and richer dynamical behavior, and displays a series of damped oscillations under various experimental situations, reflecting the intricate balance and competition between the NVE-SR collective coupling and the adjacent-site photon hopping. Particularly, we find that the inhomogeneous broadening of the spin ensemble can suppress the population transfer between the SR and the local NVE. In this context, although the inhomogeneous broadening of the spin ensemble diminishes entanglement among the NVEs, optimal entanglement, characterized by averaging the lower bound of concurrence, could be achieved through accurately adjusting the tunable parameters.
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Affiliation(s)
- Wan-Lu Song
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China.,University of the Chinese Academy of Sciences, Beijing 100049, China
| | - Wan-Li Yang
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China
| | - Zhang-Qi Yin
- The Center for Quantum Information, Institute for Interdisciplinary Information Sciences, Tsinghua University, Beijing 100084, P. R. China
| | - Chang-Yong Chen
- Department of Physics, Shaoguan University, Shaoguan, Guangdong 512005, China
| | - Mang Feng
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China
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39
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Liu T, Su QP, Xiong SJ, Liu JM, Yang CP, Nori F. Generation of a macroscopic entangled coherent state using quantum memories in circuit QED. Sci Rep 2016; 6:32004. [PMID: 27562055 PMCID: PMC4999958 DOI: 10.1038/srep32004] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2016] [Accepted: 08/01/2016] [Indexed: 11/13/2022] Open
Abstract
W-type entangled states can be used as quantum channels for, e.g., quantum teleportation, quantum dense coding, and quantum key distribution. In this work, we propose a way to generate a macroscopic W-type entangled coherent state using quantum memories in circuit QED. The memories considered here are nitrogen-vacancy center ensembles (NVEs), each located in a different cavity. This proposal does not require initially preparing each NVE in a coherent state instead of a ground state, which should significantly reduce its experimental difficulty. For most of the operation time, each cavity remains in a vacuum state, thus decoherence caused by the cavity decay and the unwanted inter-cavity crosstalk are greatly suppressed. Moreover, only one external-cavity coupler qubit is needed, which simplifies the circuit.
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Affiliation(s)
- Tong Liu
- Department of Physics, Hangzhou Normal University, Hangzhou, Zhejiang 310036, China
| | - Qi-Ping Su
- Department of Physics, Hangzhou Normal University, Hangzhou, Zhejiang 310036, China
| | - Shao-Jie Xiong
- Department of Physics, Hangzhou Normal University, Hangzhou, Zhejiang 310036, China
| | - Jin-Ming Liu
- State Key Laboratory of Precision Spectroscopy, Department of Physics, East China Normal University, Shanghai 200062, China
| | - Chui-Ping Yang
- Department of Physics, Hangzhou Normal University, Hangzhou, Zhejiang 310036, China
| | - Franco Nori
- CEMS, RIKEN, Saitama 351-0198, Japan
- Department of Physics, The University of Michigan, Ann Arbor, Michigan 48109-1040, USA
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40
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Matsuzaki Y, Morishita H, Shimooka T, Tashima T, Kakuyanagi K, Semba K, Munro WJ, Yamaguchi H, Mizuochi N, Saito S. Optically detected magnetic resonance of high-density ensemble of NV - centers in diamond. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2016; 28:275302. [PMID: 27214571 DOI: 10.1088/0953-8984/28/27/275302] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Optically detected magnetic resonance (ODMR) is a way to characterize the ensemble of NV-centers. Recently, a remarkably sharp dip was observed in the ODMR with a high-density ensemble of NV centers. The model (Zhu et al 2014 Nat. Commun. 5 3424) indicated that such a dip was due to the spin-1 properties of the NV- centers. Here, we present many more details of the analysis to show how this model can be applied to investigate the properties of the NV- centers. By using our model, we have reproduced the ODMR with and without applied external magnetic fields. Additionally, we investigate how the ODMR is affected by the typical parameters of the ensemble NV- centers such as strain distributions, inhomogeneous magnetic fields, and homogeneous broadening width. Our model provides a way to characterize the NV- center from the ODMR, which would be crucial to realize diamond-based quantum information processing.
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Affiliation(s)
- Y Matsuzaki
- NTT Basic Research Laboratories, NTT Corporation, Atsugi, Kanagawa, 243-0198, Japan
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41
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Li PB, Xiang ZL, Rabl P, Nori F. Hybrid Quantum Device with Nitrogen-Vacancy Centers in Diamond Coupled to Carbon Nanotubes. PHYSICAL REVIEW LETTERS 2016; 117:015502. [PMID: 27419577 DOI: 10.1103/physrevlett.117.015502] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/01/2015] [Indexed: 06/06/2023]
Abstract
We show that nitrogen-vacancy (NV) centers in diamond interfaced with a suspended carbon nanotube carrying a dc current can facilitate a spin-nanomechanical hybrid device. We demonstrate that strong magnetomechanical interactions between a single NV spin and the vibrational mode of the suspended nanotube can be engineered and dynamically tuned by external control over the system parameters. This spin-nanomechanical setup with strong, intrinsic, and tunable magnetomechanical couplings allows for the construction of hybrid quantum devices with NV centers and carbon-based nanostructures, as well as phonon-mediated quantum information processing with spin qubits.
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Affiliation(s)
- Peng-Bo Li
- Center for Emergent Matter Science, RIKEN, Saitama 351-0198, Japan
- Department of Applied Physics, Xi'an Jiaotong University, Xi'an 710049, China
| | - Ze-Liang Xiang
- Vienna Center for Quantum Science and Technology, Atominstitut, TU Wien, 1020 Vienna, Austria
| | - Peter Rabl
- Vienna Center for Quantum Science and Technology, Atominstitut, TU Wien, 1020 Vienna, Austria
| | - Franco Nori
- Center for Emergent Matter Science, RIKEN, Saitama 351-0198, Japan
- Department of Physics, The University of Michigan, Ann Arbor, Michigan 48109-1040, USA
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42
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Entanglement dynamics of Nitrogen-vacancy centers spin ensembles coupled to a superconducting resonator. Sci Rep 2016; 6:21775. [PMID: 26902910 PMCID: PMC4763275 DOI: 10.1038/srep21775] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2015] [Accepted: 01/29/2016] [Indexed: 12/02/2022] Open
Abstract
Exploration of macroscopic quantum entanglement is of great interest in both fundamental science and practical application. We investigate a hybrid quantum system that consists of two nitrogen-vacancy centers ensembles (NVE) coupled to a superconducting coplanar waveguide resonator (CPWR). The collective magnetic coupling between the NVE and the CPWR is employed to generate macroscopic entanglement between the NVEs, where the CPWR acts as the quantum bus. We find that, this NVE-CPWR hybrid system behaves as a system of three coupled harmonic oscillators, and the excitation prepared initially in the CPWR can be distributed into these two NVEs. In the nondissipative case, the entanglement of NVEs oscillates periodically and the maximal entanglement always keeps unity if the CPWR is initially prepared in the odd coherent state. Considering the dissipative effect from the CPWR and NVEs, the amount of entanglement between these two NVEs strongly depends on the initial state of the CPWR, and the maximal entanglement can be tuned by adjusting the initial states of the total system. The experimental feasibility and challenge with currently available technology are discussed.
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43
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Jamonneau P, Hétet G, Dréau A, Roch JF, Jacques V. Coherent Population Trapping of a Single Nuclear Spin Under Ambient Conditions. PHYSICAL REVIEW LETTERS 2016; 116:043603. [PMID: 26871331 DOI: 10.1103/physrevlett.116.043603] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/28/2015] [Indexed: 06/05/2023]
Abstract
We demonstrate coherent population trapping of a single nuclear spin in a room-temperature solid. To this end, we exploit a three-level system with a Λ configuration in the microwave domain, which consists of nuclear spin states addressed through their hyperfine coupling to the electron spin of a single nitrogen-vacancy defect in diamond. Moreover, the Λ-scheme relaxation is externally controlled through incoherent optical pumping and separated in time from consecutive coherent microwave excitations. Such a scheme allows us (i) to monitor the sequential accumulation of population into the dark state and (ii) to reach a novel regime of coherent population trapping dynamics for which periodic arrays of dark resonances can be observed, owing to multiple constructive interferences. This Letter offers new prospects for quantum state preparation, information storage in hybrid quantum systems, and metrology.
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Affiliation(s)
- P Jamonneau
- Laboratoire Aimé Cotton, CNRS, Université Paris-Sud, ENS Cachan, Université Paris-Saclay91405 Orsay Cedex, France
| | - G Hétet
- Laboratoire Aimé Cotton, CNRS, Université Paris-Sud, ENS Cachan, Université Paris-Saclay91405 Orsay Cedex, France
- Laboratoire Pierre Aigrain, CNRS, Université Pierre et Marie Curie, Université Paris Diderot and Ecole Normale Supérieure, 75005 Paris, France
| | - A Dréau
- Laboratoire Aimé Cotton, CNRS, Université Paris-Sud, ENS Cachan, Université Paris-Saclay91405 Orsay Cedex, France
| | - J-F Roch
- Laboratoire Aimé Cotton, CNRS, Université Paris-Sud, ENS Cachan, Université Paris-Saclay91405 Orsay Cedex, France
| | - V Jacques
- Laboratoire Aimé Cotton, CNRS, Université Paris-Sud, ENS Cachan, Université Paris-Saclay91405 Orsay Cedex, France
- Laboratoire Charles Coulomb, Université de Montpellier and CNRS, 34095 Montpellier, France
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44
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Rossi MAC, Paris MGA. Non-Markovian dynamics of single- and two-qubit systems interacting with Gaussian and non-Gaussian fluctuating transverse environments. J Chem Phys 2016; 144:024113. [DOI: 10.1063/1.4939733] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Matteo A. C. Rossi
- Quantum Technology Lab, Dipartimento di Fisica, Università degli Studi di Milano, 20133 Milano, Italy
| | - Matteo G. A. Paris
- Quantum Technology Lab, Dipartimento di Fisica, Università degli Studi di Milano, 20133 Milano, Italy
- CNISM, Unità Milano Statale, I-20133 Milano, Italy
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45
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Zhang FY, Chen XY, Li C, Song HS. Long-distance quantum information transfer with strong coupling hybrid solid system. Sci Rep 2015; 5:17025. [PMID: 26585779 PMCID: PMC4653632 DOI: 10.1038/srep17025] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2015] [Accepted: 10/21/2015] [Indexed: 11/23/2022] Open
Abstract
In this paper, we demonstrate how information can be transferred among the
long-distance memory units in a hybrid solid architecture, which consists the
nitrogen-vacancy (NV) ensemble acting as the memory unit, the LC circuit
acting as the transmitter (receiver), and the flux qubit acting as the interface.
Numerical simulation demonstrates that the high-fidelity quantum information
transfer between memory unit and transmitter (receiver) can be implemented, and this
process is robust to both the LC circuit decay and NV ensemble spontaneous
emission.
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Affiliation(s)
- Feng-Yang Zhang
- School of Physics and Materials Engineering, Dalian Nationalities University, Dalian 116600, China.,School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024, China
| | - Xin-Yu Chen
- School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024, China
| | - Chong Li
- School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024, China
| | - He-Shan Song
- School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024, China
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46
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Zhang X, Zou CL, Zhu N, Marquardt F, Jiang L, Tang HX. Magnon dark modes and gradient memory. Nat Commun 2015; 6:8914. [PMID: 26568130 PMCID: PMC4660366 DOI: 10.1038/ncomms9914] [Citation(s) in RCA: 203] [Impact Index Per Article: 22.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2015] [Accepted: 10/15/2015] [Indexed: 12/02/2022] Open
Abstract
Extensive efforts have been expended in developing hybrid quantum systems to overcome the short coherence time of superconducting circuits by introducing the naturally long-lived spin degree of freedom. Among all the possible materials, single-crystal yttrium iron garnet has shown up recently as a promising candidate for hybrid systems, and various highly coherent interactions, including strong and even ultrastrong coupling, have been demonstrated. One distinct advantage in these systems is that spins form well-defined magnon modes, which allows flexible and precise tuning. Here we demonstrate that by dissipation engineering, a non-Markovian interaction dynamics between the magnon and the microwave cavity photon can be achieved. Such a process enables us to build a magnon gradient memory to store information in the magnon dark modes, which decouple from the microwave cavity and thus preserve a long lifetime. Our findings provide a promising approach for developing long-lifetime, multimode quantum memories. Yttrium iron garnet is a ferrimagnetic insulator which demonstrates robust photon-spin coupling in hybrid microwave cavity systems. Here, the authors demonstrate a magnon gradient memory based on the dark modes of a strongly-coupled system of multiple yttrium iron garnet spheres.
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Affiliation(s)
- Xufeng Zhang
- Department of Electrical Engineering, Yale University, New Haven, Connecticut 06511, USA
| | - Chang-Ling Zou
- Department of Electrical Engineering, Yale University, New Haven, Connecticut 06511, USA.,Department of Applied Physics, Yale University, New Haven, Connecticut 06511, USA.,Key Lab of Quantum Information, University of Science and Technology of China, CAS, Hefei 230026, China
| | - Na Zhu
- Department of Electrical Engineering, Yale University, New Haven, Connecticut 06511, USA
| | - Florian Marquardt
- Institute for Theoretical Physics II, University of Erlangen-Nuremberg, Staudtstrasse 7, 91058 Erlangen, Germany.,Max Planck Institute for the Science of Light, Günther-Scharowsky-Straße 1/Bau 24, 91058 Erlangen, Germany
| | - Liang Jiang
- Department of Applied Physics, Yale University, New Haven, Connecticut 06511, USA
| | - Hong X Tang
- Department of Electrical Engineering, Yale University, New Haven, Connecticut 06511, USA
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Tanaka T, Knott P, Matsuzaki Y, Dooley S, Yamaguchi H, Munro WJ, Saito S. Proposed Robust Entanglement-Based Magnetic Field Sensor Beyond the Standard Quantum Limit. PHYSICAL REVIEW LETTERS 2015; 115:170801. [PMID: 26551094 DOI: 10.1103/physrevlett.115.170801] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/05/2014] [Indexed: 06/05/2023]
Abstract
Recently, there have been significant developments in entanglement-based quantum metrology. However, entanglement is fragile against experimental imperfections, and quantum sensing to beat the standard quantum limit in scaling has not yet been achieved in realistic systems. Here, we show that it is possible to overcome such restrictions so that one can sense a magnetic field with an accuracy beyond the standard quantum limit even under the effect of decoherence, by using a realistic entangled state that can be easily created even with current technology. Our scheme could pave the way for the realizations of practical entanglement-based magnetic field sensors.
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Affiliation(s)
- Tohru Tanaka
- NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato-Wakamiya, Atsugi, Kanagawa 243-0198, Japan
- Department of Physics, Waseda University, Tokyo 169-8555, Japan
| | - Paul Knott
- NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato-Wakamiya, Atsugi, Kanagawa 243-0198, Japan
| | - Yuichiro Matsuzaki
- NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato-Wakamiya, Atsugi, Kanagawa 243-0198, Japan
| | - Shane Dooley
- NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato-Wakamiya, Atsugi, Kanagawa 243-0198, Japan
- National Institute of Informatics, 2-1-2 Hitotsubashi, Chiyoda-ku, Tokyo 101-8430, Japan
| | - Hiroshi Yamaguchi
- NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato-Wakamiya, Atsugi, Kanagawa 243-0198, Japan
| | - William J Munro
- NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato-Wakamiya, Atsugi, Kanagawa 243-0198, Japan
| | - Shiro Saito
- NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato-Wakamiya, Atsugi, Kanagawa 243-0198, Japan
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48
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Cai H, Matsuzaki Y, Kakuyanagi K, Toida H, Zhu X, Mizuochi N, Nemoto K, Semba K, Munro WJ, Saito S, Yamaguchi H. Analysis of the spectroscopy of a hybrid system composed of a superconducting flux qubit and diamond NV(-) centers. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2015; 27:345702. [PMID: 26252646 DOI: 10.1088/0953-8984/27/34/345702] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
A hybrid system that combines the advantages of a superconductor flux qubit and an electron spin ensemble in diamond is one of the promising devices to realize quantum information processing. Exploring the properties of the superconductor diamond system is essential for the efficient use of this device. When we perform spectroscopy of this system, significant power broadening is observed. However, previous models to describe this system are known to be applicable only when the power broadening is negligible. Here, we construct a new approach to analyze this system with strong driving, and succeed in reproducing the spectrum with the power broadening. Our results provide an efficient way to analyze this hybrid system.
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Affiliation(s)
- H Cai
- NTT Basic Research Laboratories, NTT Corporation, Atsugi, Kanagawa 243-0198, Japan. Department of Physics, Tohoku University, Sendai, Miyagi 980-8578, Japan
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49
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Viennot JJ, Dartiailh MC, Cottet A, Kontos T. Coherent coupling of a single spin to microwave cavity photons. Science 2015. [DOI: 10.1126/science.aaa3786] [Citation(s) in RCA: 145] [Impact Index Per Article: 16.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Affiliation(s)
- J. J. Viennot
- Laboratoire Pierre Aigrain, Ecole Normale Supérieure–PSL Research University, CNRS, Université Pierre et Marie Curie–Sorbonne Universités, Université Paris Diderot–Sorbonne Paris Cité, 24 rue Lhomond, 75231 Paris Cedex 05, France
| | - M. C. Dartiailh
- Laboratoire Pierre Aigrain, Ecole Normale Supérieure–PSL Research University, CNRS, Université Pierre et Marie Curie–Sorbonne Universités, Université Paris Diderot–Sorbonne Paris Cité, 24 rue Lhomond, 75231 Paris Cedex 05, France
| | - A. Cottet
- Laboratoire Pierre Aigrain, Ecole Normale Supérieure–PSL Research University, CNRS, Université Pierre et Marie Curie–Sorbonne Universités, Université Paris Diderot–Sorbonne Paris Cité, 24 rue Lhomond, 75231 Paris Cedex 05, France
| | - T. Kontos
- Laboratoire Pierre Aigrain, Ecole Normale Supérieure–PSL Research University, CNRS, Université Pierre et Marie Curie–Sorbonne Universités, Université Paris Diderot–Sorbonne Paris Cité, 24 rue Lhomond, 75231 Paris Cedex 05, France
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50
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Tabuchi Y, Ishino S, Noguchi A, Ishikawa T, Yamazaki R, Usami K, Nakamura Y. Coherent coupling between a ferromagnetic magnon and a superconducting qubit. Science 2015; 349:405-8. [DOI: 10.1126/science.aaa3693] [Citation(s) in RCA: 365] [Impact Index Per Article: 40.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2014] [Accepted: 05/26/2015] [Indexed: 11/02/2022]
Affiliation(s)
- Yutaka Tabuchi
- Research Center for Advanced Science and Technology (RCAST), The University of Tokyo, Meguro-ku, Tokyo 153-8904, Japan
| | - Seiichiro Ishino
- Research Center for Advanced Science and Technology (RCAST), The University of Tokyo, Meguro-ku, Tokyo 153-8904, Japan
| | - Atsushi Noguchi
- Research Center for Advanced Science and Technology (RCAST), The University of Tokyo, Meguro-ku, Tokyo 153-8904, Japan
| | - Toyofumi Ishikawa
- Research Center for Advanced Science and Technology (RCAST), The University of Tokyo, Meguro-ku, Tokyo 153-8904, Japan
| | - Rekishu Yamazaki
- Research Center for Advanced Science and Technology (RCAST), The University of Tokyo, Meguro-ku, Tokyo 153-8904, Japan
| | - Koji Usami
- Research Center for Advanced Science and Technology (RCAST), The University of Tokyo, Meguro-ku, Tokyo 153-8904, Japan
| | - Yasunobu Nakamura
- Research Center for Advanced Science and Technology (RCAST), The University of Tokyo, Meguro-ku, Tokyo 153-8904, Japan
- Center for Emergent Matter Science (CEMS), RIKEN, Wako, Saitama 351-0198, Japan
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