1
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Mori Y, Kawabata S, Matsuzaki Y. How to experimentally evaluate the adiabatic condition for quantum annealing. Sci Rep 2024; 14:8177. [PMID: 38589470 PMCID: PMC11001971 DOI: 10.1038/s41598-024-58286-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2023] [Accepted: 03/27/2024] [Indexed: 04/10/2024] Open
Abstract
We propose an experimental method for evaluating the adiabatic condition during quantum annealing (QA), which will be essential for solving practical problems. The adiabatic condition consists of the transition matrix element and the energy gap, and our method simultaneously provides information about these components without diagonalizing the Hamiltonian. The key idea is to measure the power spectrum of a time domain signal by adding an oscillating field during QA, and we can estimate the values of the transition matrix element and energy gap from the measurement output. Our results provides a powerful experimental basis for analyzing the performance of QA.
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Affiliation(s)
- Yuichiro Mori
- Global Research and Development Center for Business by Quantum-AI Technology (G-QuAT), National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1, Umezono, Tsukuba, Ibaraki, 305-8568, Japan.
| | - Shiro Kawabata
- Global Research and Development Center for Business by Quantum-AI Technology (G-QuAT), 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.
| | - Yuichiro Matsuzaki
- Global Research and Development Center for Business by Quantum-AI Technology (G-QuAT), 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.
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2
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Kamimura S, Yoshida K, Tokura Y, Matsuzaki Y. Universal Scaling Bounds on a Quantum Heat Current. Phys Rev Lett 2023; 131:090401. [PMID: 37721850 DOI: 10.1103/physrevlett.131.090401] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/30/2022] [Accepted: 05/30/2023] [Indexed: 09/20/2023]
Abstract
In this Letter, we derive new bounds on a heat current flowing into a quantum L-particle system coupled with a Markovian environment. By assuming that a system Hamiltonian and a system-environment interaction Hamiltonian are extensive in L, we prove that the absolute value of the heat current scales at most as Θ(L^{3}) in a limit of large L. Furthermore, we present an example of noninteracting particles globally coupled with a thermal bath, for which this bound is saturated in terms of scaling. However, the construction of such a system requires many-body interactions induced by the environment, which may be difficult to realize with the existing technology. To consider more feasible cases, we consider a class of the system where any nondiagonal elements of the noise operator (derived from the system-environment interaction Hamiltonian) become zero in the system energy basis, if the energy difference exceeds a certain value ΔE. Then, for ΔE=Θ(L^{0}), we derive another scaling bound Θ(L^{2}) on the absolute value of the heat current, and the so-called superradiance belongs to a class for which this bound is saturated. Our results are useful for evaluating the best achievable performance of quantum-enhanced thermodynamic devices, including far-reaching applications such as quantum heat engines, quantum refrigerators, and quantum batteries.
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Affiliation(s)
- Shunsuke Kamimura
- Faculty of Pure and Applied Sciences, University of Tsukuba, Tsukuba 305-8571, Japan
- Research Center for Emerging Computing Technologies, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568, Japan
| | - Kyo Yoshida
- Faculty of Pure and Applied Sciences, University of Tsukuba, Tsukuba 305-8571, Japan
| | - Yasuhiro Tokura
- Faculty of Pure and Applied Sciences, University of Tsukuba, Tsukuba 305-8571, Japan
| | - 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
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3
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Yamamoto K, Endo S, Hakoshima H, Matsuzaki Y, Tokunaga Y. Error-Mitigated Quantum Metrology via Virtual Purification. Phys Rev Lett 2022; 129:250503. [PMID: 36608222 DOI: 10.1103/physrevlett.129.250503] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/10/2021] [Revised: 07/13/2022] [Accepted: 08/11/2022] [Indexed: 06/17/2023]
Abstract
Quantum metrology with entangled resources aims to achieve sensitivity beyond the standard quantum limit by harnessing quantum effects even in the presence of environmental noise. So far, sensitivity has been mainly discussed from the viewpoint of reducing statistical errors under the assumption of perfect knowledge of a noise model. However, we cannot always obtain complete information about a noise model due to coherence time fluctuations, which are frequently observed in experiments. Such unknown fluctuating noise leads to systematic errors and nullifies the quantum advantages. Here, we propose an error-mitigated quantum metrology that can filter out unknown fluctuating noise with the aid of purification-based quantum error mitigation. We demonstrate that our protocol mitigates systematic errors and recovers superclassical scaling in a practical situation with time-inhomogeneous bias-inducing noise. Our result is the first demonstration to reveal the usefulness of purification-based error mitigation for unknown fluctuating noise, thus paving the way not only for practical quantum metrology but also for quantum computation affected by such noise.
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Affiliation(s)
- Kaoru Yamamoto
- NTT Computer and Data Science Laboratories, NTT Corporation, Musashino 180-8585, Japan
| | - Suguru Endo
- NTT Computer and Data Science Laboratories, NTT Corporation, Musashino 180-8585, Japan
- JST, PRESTO, 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan
| | - Hideaki Hakoshima
- Research Center for Emerging Computing Technologies, National Institute of Advanced Industrial Science and Technology (AIST), Central2, 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568, Japan
- Center for Quantum Information and Quantum Biology, Osaka University, 1-2 Machikaneyama, Toyonaka 560-0043, Japan
| | - Yuichiro Matsuzaki
- Research Center for Emerging Computing Technologies, National Institute of Advanced Industrial Science and Technology (AIST), Central2, 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
| | - Yuuki Tokunaga
- NTT Computer and Data Science Laboratories, NTT Corporation, Musashino 180-8585, Japan
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4
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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] [What about the content of this article? (0)] [Affiliation(s)] [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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5
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Yoshinaga A, Hakoshima H, Imoto T, Matsuzaki Y, Hamazaki R. Emergence of Hilbert Space Fragmentation in Ising Models with a Weak Transverse Field. Phys Rev Lett 2022; 129:090602. [PMID: 36083664 DOI: 10.1103/physrevlett.129.090602] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/02/2021] [Revised: 04/10/2022] [Accepted: 08/05/2022] [Indexed: 06/15/2023]
Abstract
The transverse-field Ising model is one of the fundamental models in quantum many-body systems, yet a full understanding of its dynamics remains elusive in higher than one dimension. Here, we show for the first time the breakdown of ergodicity in d-dimensional Ising models with a weak transverse field in a prethermal regime. We demonstrate that novel Hilbert-space fragmentation occurs in the effective nonintegrable model with d≥2 as a consequence of only one emergent global conservation law of the domain wall number. Our results indicate nontrivial initial-state dependence for nonequilibrium dynamics of the Ising models with a weak transverse field.
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Affiliation(s)
- Atsuki Yoshinaga
- Department of Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8574, Japan
- Research Center for Emerging Computing Technologies, National institute of Advanced Industrial Science and Technology (AIST), Central2, 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568, Japan
| | - Hideaki Hakoshima
- Research Center for Emerging Computing Technologies, National institute of Advanced Industrial Science and Technology (AIST), Central2, 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568, Japan
- Center for Quantum Information and Quantum Biology, Osaka University, 1-2 Machikaneyama, Toyonaka 560-0043, Japan
| | - Takashi Imoto
- Research Center for Emerging Computing Technologies, National institute of Advanced Industrial Science and Technology (AIST), Central2, 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568, Japan
| | - Yuichiro Matsuzaki
- Research Center for Emerging Computing Technologies, National institute of Advanced Industrial Science and Technology (AIST), Central2, 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568, Japan
| | - Ryusuke Hamazaki
- Nonequilibrium Quantum Statistical Mechanics RIKEN Hakubi Research Team, RIKEN Cluster for Pioneering Research (CPR), RIKEN iTHEMS, Wako, Saitama 351-0198, Japan
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6
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Yoshioka N, Hakoshima H, Matsuzaki Y, Tokunaga Y, Suzuki Y, Endo S. Generalized Quantum Subspace Expansion. Phys Rev Lett 2022; 129:020502. [PMID: 35867434 DOI: 10.1103/physrevlett.129.020502] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/29/2021] [Accepted: 02/16/2022] [Indexed: 06/15/2023]
Abstract
One of the major challenges for erroneous quantum computers is undoubtedly the control over the effect of noise. Considering the rapid growth of available quantum resources that are not fully fault tolerant, it is crucial to develop practical hardware-friendly quantum error mitigation (QEM) techniques to suppress unwanted errors. Here, we propose a novel generalized quantum subspace expansion method which can handle stochastic, coherent, and algorithmic errors in quantum computers. By fully exploiting the substantially extended subspace, we can efficiently mitigate the noise present in the spectra of a given Hamiltonian, without relying on any information of noise. The performance of our method is discussed under two highly practical setups: the quantum subspaces are mainly spanned by powers of the noisy state ρ^{m} and a set of error-boosted states, respectively. We numerically demonstrate in both situations that we can suppress errors by orders of magnitude, and show that our protocol inherits the advantages of previous error-agnostic QEM techniques as well as overcoming their drawbacks.
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Affiliation(s)
- Nobuyuki Yoshioka
- Department of Applied Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
- Theoretical Quantum Physics Laboratory, RIKEN Cluster for Pioneering Research (CPR), Wako-shi, Saitama 351-0198, Japan
| | - Hideaki Hakoshima
- Research Center for Emerging Computing Technologies, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568, Japan
- Center for Quantum Information and Quantum Biology, Osaka University, 1-2 Machikaneyama, Toyonaka 560-0043, Japan
| | - 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
| | - Yuuki Tokunaga
- NTT Computer and Data Science Laboratories, NTT Corporation, Musashino 180-8585, Japan
| | - Yasunari Suzuki
- NTT Computer and Data Science Laboratories, NTT Corporation, Musashino 180-8585, Japan
- JST, PRESTO, 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan
| | - Suguru Endo
- NTT Computer and Data Science Laboratories, NTT Corporation, Musashino 180-8585, Japan
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7
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Kamimura S, Hakoshima H, Matsuzaki Y, Yoshida K, Tokura Y. Quantum-Enhanced Heat Engine Based on Superabsorption. Phys Rev Lett 2022; 128:180602. [PMID: 35594102 DOI: 10.1103/physrevlett.128.180602] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/29/2021] [Revised: 12/21/2021] [Accepted: 03/21/2022] [Indexed: 06/15/2023]
Abstract
We propose a quantum-enhanced heat engine with entanglement. The key feature of our scheme is superabsorption, which facilitates enhanced energy absorption by entangled qubits. Whereas a conventional engine with N separable qubits provides power with a scaling of P=Θ(N), our engine uses superabsorption to provide power with a quantum scaling of P=Θ(N^{2}). This quantum heat engine also exhibits a scaling advantage over classical ones composed of N-particle Langevin systems. Our work elucidates the quantum properties allowing for the enhancement of performance.
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Affiliation(s)
- Shunsuke Kamimura
- Research Center for Emerging Computing Technologies, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568, Japan
- Faculty of Pure and Applied Sciences, University of Tsukuba, Tsukuba 305-8571, Japan
| | - Hideaki Hakoshima
- Research Center for Emerging Computing Technologies, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568, Japan
- Center for Quantum Information and Quantum Biology, Osaka University, 1-2 Machikaneyama, Toyonaka 560-0043, Japan
| | - 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
| | - Kyo Yoshida
- Faculty of Pure and Applied Sciences, University of Tsukuba, Tsukuba 305-8571, Japan
| | - Yasuhiro Tokura
- Faculty of Pure and Applied Sciences, University of Tsukuba, Tsukuba 305-8571, Japan
- Tsukuba Research Center for Energy Materials Science (TREMS), Tsukuba 305-8571, Japan
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8
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Minakawa S, Matsuzaki Y, Rokunohe D, Kumagai N, Kurose A, Kushibiki M, Kayaba H, Sawamura D. Hidradenitis suppurativa with perifolliculitis capitis abscedens et suffodiens successfully treated with a human anti-tumour necrosis factor monoclonal antibody. Clin Exp Dermatol 2021; 46:1586-1588. [PMID: 34096639 DOI: 10.1111/ced.14789] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2021] [Accepted: 06/02/2021] [Indexed: 11/28/2022]
Affiliation(s)
- S Minakawa
- Department of Dermatology, Hirosaki University Graduate School of Medicine, Aomori, Japan.,Department of Clinical Laboratory, Hirosaki University Hospital, Aomori, Japan
| | - Y Matsuzaki
- Department of Dermatology, Hirosaki University Graduate School of Medicine, Aomori, Japan
| | - D Rokunohe
- Department of Dermatology, Hirosaki University Graduate School of Medicine, Aomori, Japan
| | - N Kumagai
- Department of Anatomic Pathology, Hirosaki University Hospital, Aomori, Japan
| | - A Kurose
- Department of Anatomic Pathology, Hirosaki University Hospital, Aomori, Japan
| | - M Kushibiki
- Department of Clinical Laboratory, Hirosaki University Hospital, Aomori, Japan
| | - H Kayaba
- Department of Clinical Laboratory, Hirosaki University Hospital, Aomori, Japan
| | - D Sawamura
- Department of Dermatology, Hirosaki University Graduate School of Medicine, Aomori, Japan
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9
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Matsuzaki Y, Benjamin S, Nakayama S, Saito S, Munro WJ. Quantum Metrology beyond the Classical Limit under the Effect of Dephasing. Phys Rev Lett 2018; 120:140501. [PMID: 29694131 DOI: 10.1103/physrevlett.120.140501] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/04/2017] [Indexed: 06/08/2023]
Abstract
Quantum sensors have the potential to outperform their classical counterparts. For classical sensing, the uncertainty of the estimation of the target fields scales inversely with the square root of the measurement time T. On the other hand, by using quantum resources, we can reduce this scaling of the uncertainty with time to 1/T. However, as quantum states are susceptible to dephasing, it has not been clear whether we can achieve sensitivities with a scaling of 1/T for a measurement time longer than the coherence time. Here, we propose a scheme that estimates the amplitude of globally applied fields with the uncertainty of 1/T for an arbitrary time scale under the effect of dephasing. We use one-way quantum-computing-based teleportation between qubits to prevent any increase in the correlation between the quantum state and its local environment from building up and have shown that such a teleportation protocol can suppress the local dephasing while the information from the target fields keeps growing. Our method has the potential to realize a quantum sensor with a sensitivity far beyond that of any classical sensor.
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Affiliation(s)
- Yuichiro Matsuzaki
- NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato-Wakamiya, Atsugi, Kanagawa 243-0198, Japan
- NTT Theoretical Quantum Physics Center, NTT Corporation, 3-1 Morinosato-Wakamiya, Atsugi, Kanagawa 243-0198, Japan
| | - Simon Benjamin
- Department of Materials, University of Oxford, Oxford OX1 3PH, United Kingdom
| | - Shojun Nakayama
- National Institute of Informatics, 2-1-2 Hitotsubashi, Chiyoda-ku, Tokyo 101-8430, Japan
| | - Shiro Saito
- 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
- NTT Theoretical Quantum Physics Center, 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
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10
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Kobayashi J, Tahara T, Matsuzaki Y, Ono Y, Matsumoto J, Sato H, Onko K, Kishimoto Y, Tanino T, Sakaguchi H, Uchida N. PO-0999: Control of rectal volume with Kampo formula during prostate radiotherapy: A prospective study. Radiother Oncol 2017. [DOI: 10.1016/s0167-8140(17)31435-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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11
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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. Phys Rev Lett 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] [What about the content of this article? (0)] [Affiliation(s)] [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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12
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Knee GC, Kakuyanagi K, Yeh MC, Matsuzaki Y, Toida H, Yamaguchi H, Saito S, Leggett AJ, Munro WJ. A strict experimental test of macroscopic realism in a superconducting flux qubit. Nat Commun 2016; 7:13253. [PMID: 27811844 PMCID: PMC5097155 DOI: 10.1038/ncomms13253] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2016] [Accepted: 09/15/2016] [Indexed: 11/15/2022] Open
Abstract
Macroscopic realism is the name for a class of modifications to quantum theory that allow macroscopic objects to be described in a measurement-independent manner, while largely preserving a fully quantum mechanical description of the microscopic world. Objective collapse theories are examples which aim to solve the quantum measurement problem through modified dynamical laws. Whether such theories describe nature, however, is not known. Here we describe and implement an experimental protocol capable of constraining theories of this class, that is more noise tolerant and conceptually transparent than the original Leggett–Garg test. We implement the protocol in a superconducting flux qubit, and rule out (by ∼84 s.d.) those theories which would deny coherent superpositions of 170 nA currents over a ∼10 ns timescale. Further, we address the ‘clumsiness loophole' by determining classical disturbance with control experiments. Our results constitute strong evidence for the superposition of states of nontrivial macroscopic distinctness. Objective collapse theories are formulations of quantum physics that attempt to solve the measurement problem through modified dynamical laws. Here, the authors constrain such theories by testing a generalization of the Leggett-Garg inequality in a superconducting flux qubit experiment.
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Affiliation(s)
- George C Knee
- NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato-Wakamiya, Atsugi, Kanagawa 243-0198, Japan
| | - Kosuke Kakuyanagi
- NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato-Wakamiya, Atsugi, Kanagawa 243-0198, Japan
| | - Mao-Chuang Yeh
- Department of Physics, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
| | - Yuichiro Matsuzaki
- 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
| | - Hiroshi Yamaguchi
- 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
| | - Anthony J Leggett
- Department of Physics, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
| | - William J Munro
- NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato-Wakamiya, Atsugi, Kanagawa 243-0198, Japan
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13
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Jenkins C, Yang Y, Yu S, Yu H, Matsuzaki Y, Yoshimura T, Fujii Y, Umegaki K, Shirato H, Xing L. Autonomous Quality Assurance for Spot-Scanning Proton Therapy and SRS/SBRT Using Radioluminescent Phantoms, Optical Imaging, and Machine Vision. Int J Radiat Oncol Biol Phys 2016. [DOI: 10.1016/j.ijrobp.2016.06.429] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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14
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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. J Phys Condens Matter 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] [What about the content of this article? (0)] [Affiliation(s)] [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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15
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Minakawa S, Tanaka H, Kaneko T, Matsuzaki Y, Kono M, Akiyama M, Minegishi Y, Sawamura D. Hyper-IgE syndrome with a novel mutation of the STAT3 gene. Clin Exp Dermatol 2016; 41:687-9. [PMID: 27333819 DOI: 10.1111/ced.12865] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/23/2015] [Indexed: 11/27/2022]
Affiliation(s)
- S Minakawa
- Department of Dermatology, Hirosaki University Graduate School of Medicine, Aomori, Japan.
| | - H Tanaka
- Department of Pediatrics, Hirosaki University Graduate School of Medicine, Aomori, Japan
| | - T Kaneko
- Department of Dermatology, Hirosaki University Graduate School of Medicine, Aomori, Japan
| | - Y Matsuzaki
- Department of Dermatology, Hirosaki University Graduate School of Medicine, Aomori, Japan
| | - M Kono
- Department of Dermatology, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - M Akiyama
- Department of Dermatology, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Y Minegishi
- Division of Molecular Medicine, Institute for Genome Research, University of Tokushima, Tokushima, Japan
| | - D Sawamura
- Department of Dermatology, Hirosaki University Graduate School of Medicine, Aomori, Japan
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16
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Matsuura T, Takao S, Matsuzaki Y, Fujii Y, Fujii T, Maeda K, Ueda H, Koyano H, Umegaki K, Shirato H. SU-F-T-131: No Increase in Biological Effectiveness Through Collimator Scattered Low Energy Protons. Med Phys 2016. [DOI: 10.1118/1.4956267] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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17
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Matsuzaki Y, Jenkins C, Yang Y, Yoshimura T, Fujii Y, Umegaki K, Xing L. TU-FG-BRB-12: Real-Time Visualization of Discrete Spot Scanning Proton Therapy Beam for Quality Assurance. Med Phys 2016. [DOI: 10.1118/1.4957552] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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18
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Kanehira T, Matsuura T, Takao S, Matsuzaki Y, Fujii Y, Fujii T, Miyamoto N, Inoue T, Katoh N, Shimizu S, Umegaki K, Shirato H. TH-CD-209-11: Simulation Study of Real-Time-Image Gating On Spot Scanning Proton Therapy for Lung Tumors. Med Phys 2016. [DOI: 10.1118/1.4958205] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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19
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Fujii T, Matsuura T, Takao S, Miyamoto N, Matsuzaki Y, Fujii Y, Umegaki K, Shimizu S, Shirato H. SU-F-I-11: Software Development for 4D-CBCT Research of Real-Time-Image Gated Spot Scanning Proton Therapy. Med Phys 2016. [DOI: 10.1118/1.4955839] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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20
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Takao S, Matsuura T, Matsuzaki Y, Fujii Y, Fujii T, Katoh N, Shimizu S, Umegaki K, Shirato H. SU-F-T-189: Dosimetric Comparison of Spot-Scanning Proton Therapy Techniques for Liver Tumors Close to the Skin Surface. Med Phys 2016. [DOI: 10.1118/1.4956326] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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21
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Yoshimura T, Kinoshita R, Onodera S, Toramatsu C, Suzuki R, Ito Y, Takao S, Matsuura T, Matsuzaki Y, Shimizu S, Umegaki K, Shirato H. NTCP Modeling Analysis of Acute Hematologic Toxicity in Whole-Pelvic Radiation Therapy for Gynecologic Malignancies: A Dosimetric Comparison of IMRT and Spot-Scanning Proton Therapy. Int J Radiat Oncol Biol Phys 2015. [DOI: 10.1016/j.ijrobp.2015.07.1187] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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22
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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. Phys Rev Lett 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] [What about the content of this article? (0)] [Affiliation(s)] [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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23
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Yasui T, Mabuchi Y, Toriumi H, Ebine T, Niibe K, Houlihan DD, Morikawa S, Onizawa K, Kawana H, Akazawa C, Suzuki N, Nakagawa T, Okano H, Matsuzaki Y. Purified Human Dental Pulp Stem Cells Promote Osteogenic Regeneration. J Dent Res 2015; 95:206-14. [PMID: 26494655 DOI: 10.1177/0022034515610748] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Human dental pulp stem/progenitor cells (hDPSCs) are attractive candidates for regenerative therapy because they can be easily expanded to generate colony-forming unit-fibroblasts (CFU-Fs) on plastic and the large cell numbers required for transplantation. However, isolation based on adherence to plastic inevitably changes the surface marker expression and biological properties of the cells. Consequently, little is currently known about the original phenotypes of tissue precursor cells that give rise to plastic-adherent CFU-Fs. To better understand the in vivo functions and translational therapeutic potential of hDPSCs and other stem cells, selective cell markers must be identified in the progenitor cells. Here, we identified a dental pulp tissue-specific cell population based on the expression profiles of 2 cell-surface markers LNGFR (CD271) and THY-1 (CD90). Prospectively isolated, dental pulp-derived LNGFR(Low+)THY-1(High+) cells represent a highly enriched population of clonogenic cells--notably, the isolated cells exhibited long-term proliferation and multilineage differentiation potential in vitro. The cells also expressed known mesenchymal cell markers and promoted new bone formation to heal critical-size calvarial defects in vivo. These findings suggest that LNGFR(Low+)THY-1(High+) dental pulp-derived cells provide an excellent source of material for bone regenerative strategies.
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Affiliation(s)
- T Yasui
- Department of Physiology, Keio University School of Medicine, Tokyo, Japan Department of Dentistry and Oral Surgery, Keio University School of Medicine, Tokyo, Japan Department of Dentistry and Oral Surgery, Kawasaki Municipal Kawasaki Hospital, Kanagawa, Japan
| | - Y Mabuchi
- Department of Physiology, Keio University School of Medicine, Tokyo, Japan Department of Biochemistry and Biophysics, Graduate School of Health Care Sciences, Tokyo Medical and Dental University, Tokyo, Japan
| | - H Toriumi
- Department of Neurology, Keio University School of Medicine, Tokyo, Japan
| | - T Ebine
- Department of Neurology, Keio University School of Medicine, Tokyo, Japan
| | - K Niibe
- Department of Dentistry and Oral Surgery, Keio University School of Medicine, Tokyo, Japan Division of Molecular and Regenerative Prosthodontics, Graduate School of Dentistry, Tohoku University, Miyagi, Japan
| | - D D Houlihan
- Centre for Liver Research, NIHR Biomedical Research Unit, University of Birmingham, Birmingham, UK
| | - S Morikawa
- Department of Dentistry and Oral Surgery, Keio University School of Medicine, Tokyo, Japan
| | - K Onizawa
- Department of Dentistry and Oral Surgery, Kawasaki Municipal Kawasaki Hospital, Kanagawa, Japan
| | - H Kawana
- Department of Dentistry and Oral Surgery, Keio University School of Medicine, Tokyo, Japan
| | - C Akazawa
- Department of Biochemistry and Biophysics, Graduate School of Health Care Sciences, Tokyo Medical and Dental University, Tokyo, Japan
| | - N Suzuki
- Department of Neurology, Keio University School of Medicine, Tokyo, Japan
| | - T Nakagawa
- Department of Dentistry and Oral Surgery, Keio University School of Medicine, Tokyo, Japan
| | - H Okano
- Department of Physiology, Keio University School of Medicine, Tokyo, Japan
| | - Y Matsuzaki
- Department of Physiology, Keio University School of Medicine, Tokyo, Japan Department of Cancer Biology, Faculty of Medicine, Shimane University, Shimane, Japan
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24
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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. J Phys Condens Matter 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] [What about the content of this article? (0)] [Affiliation(s)] [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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25
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Yamada T, Miyamoto N, Matsuura T, Takao S, Matsuzaki Y, Fujii Y, Koyano H, Nihongi H, Umezawa M, Matsuda K, Umegaki K, Shirato H. SU-E-T-266: Development of Evaluation System of Optimal Synchrotron Controlling Parameter for Spot Scanning Proton Therapy with Multiple Gate Irradiations in One Operation Cycle. Med Phys 2015. [DOI: 10.1118/1.4924628] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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26
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Miyamoto N, Takao S, Matsuura T, Matsuzaki Y, Yamada T, Fujii Y, Matsuo Y, Kidani T, Egashira Y, Umekawa T, Shimizu S, Shirato H, Umegaki K. WE-EF-303-05: Development and Commissioning of Real-Time Imaging Function for Respiratory-Gated Spot-Scanning Proton Beam Therapy. Med Phys 2015. [DOI: 10.1118/1.4925996] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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27
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Umegaki K, Matsuura T, Takao S, Matsuzaki Y, Yamada T, Fujii Y, Miyamoto N, Shimizu S, Shirato H. TH-CD-BRA-10: Startup Experience of the New Proton Beam Therapy System with Gated Spot Scanning and Real-Time Tumor-Tracking. Med Phys 2015. [DOI: 10.1118/1.4926235] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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28
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Fujii Y, Matsuura T, Takao S, Matsuzaki Y, Yamada T, Miyamoto N, Shimizu S, Umegaki K, Shirato H. SU-E-T-496: Influence of the Intrafraction Patient Repositioning On Spot Scanning Proton Therapy for Prostate Cancer. Med Phys 2015. [DOI: 10.1118/1.4924858] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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29
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Matsuura T, Fujii Y, Takao S, Yamada T, Matsuzaki Y, Miyamoto N, Takayanagi T, Fujitaka S, Shimizu S, Shirato H, Umegaki K. SU-D-304-01: Development of An Applicator for Treating Shallow and Moving Tumors with Respiratory-Gated Spot-Scanning Proton Therapy Using Real-Time Image Guidance. Med Phys 2015. [DOI: 10.1118/1.4923860] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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30
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Matsuzaki Y, Zhu X, Kakuyanagi K, Toida H, Shimo-Oka T, Mizuochi N, Nemoto K, Semba K, Munro WJ, Yamaguchi H, Saito S. Improving the coherence time of a quantum system via a coupling to a short-lived system. Phys Rev Lett 2015; 114:120501. [PMID: 25860725 DOI: 10.1103/physrevlett.114.120501] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/17/2014] [Indexed: 06/04/2023]
Abstract
In this Letter, we propose a counterintuitive use of a hybrid system where the coherence time of a quantum system can be significantly improved by coupling it with a system of a shorter coherence time. Coupling a two-level system with a single nitrogen-vacancy (NV^{-}) center, a dark state of the NV^{-} center naturally forms after the hybridization. We show that this dark state becomes robust against noise due to the coupling even when the coherence time of the two-level system is much shorter than that of the NV^{-} center. Our proposal opens a new way to use a quantum hybrid system for the realization of robust quantum information processing.
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Affiliation(s)
- Yuichiro Matsuzaki
- NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato-Wakamiya, Atsugi, Kanagawa 243-0198, Japan
| | - Xiaobo Zhu
- NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato-Wakamiya, Atsugi, Kanagawa 243-0198, Japan
| | - Kosuke Kakuyanagi
- 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
| | - Takaaki Shimo-Oka
- Graduate School of Engineering Science, University of Osaka, 1-3 Machikane-yama, Toyonaka, Osaka 560-8531, Japan
| | - Norikazu Mizuochi
- Graduate School of Engineering Science, University of Osaka, 1-3 Machikane-yama, Toyonaka, Osaka 560-8531, Japan
| | - Kae Nemoto
- National Institute of Informatics, 2-1-2 Hitotsubashi, Chiyoda-ku, Tokyo 101-8430, Japan
| | - Kouichi Semba
- National Institute of Information and Communications Technology, Koganei, Tokyo 184-8795, Japan
| | - William J Munro
- NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato-Wakamiya, Atsugi, Kanagawa 243-0198, Japan
| | - Hiroshi Yamaguchi
- 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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31
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Zhu X, Matsuzaki Y, Amsüss R, Kakuyanagi K, Shimo-Oka T, Mizuochi N, Nemoto K, Semba K, Munro WJ, Saito S. Observation of dark states in a superconductor diamond quantum hybrid system. Nat Commun 2014; 5:3424. [PMID: 24709792 PMCID: PMC3988811 DOI: 10.1038/ncomms4524] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2013] [Accepted: 02/26/2014] [Indexed: 11/09/2022] Open
Abstract
The hybridization of distinct quantum systems has opened new avenues to exploit the best properties of these individual systems. Superconducting circuits and electron spin ensembles are one such example. Strong coupling and the coherent transfer and storage of quantum information has been achieved with nitrogen vacancy centres in diamond. Recently, we have observed a remarkably sharp resonance (~1 MHz) at 2.878 GHz in the spectrum of flux qubit negatively charged nitrogen vacancy diamond hybrid quantum system under zero external magnetic field. This width is much narrower than that of both the flux qubit and spin ensemble. Here we show that this resonance is evidence of a collective dark state in the ensemble, which is coherently driven by the superposition of clockwise and counter-clockwise macroscopic persistent supercurrents flowing in the flux qubit. The collective dark state is a unique physical system and could provide a long-lived quantum memory. Recently, a sharp resonance was observed in the spectrum of a flux-qubit nitrogen-vacancy-centre hybrid quantum system that is much narrower than that of either the flux qubit or the spin ensemble. Zhu et al. investigate this resonance and find evidence of a coherently driven collective dark state.
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Affiliation(s)
- Xiaobo Zhu
- 1] NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato-Wakamiya, Atsugi, Kanagawa 243-0198, Japan [2]
| | - Yuichiro Matsuzaki
- NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato-Wakamiya, Atsugi, Kanagawa 243-0198, Japan
| | - Robert Amsüss
- 1] NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato-Wakamiya, Atsugi, Kanagawa 243-0198, Japan [2] Vienna Center for Quantum Science and Technology, Atominstitut, TU Wien, 1020 Vienna, Austria
| | - Kosuke Kakuyanagi
- NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato-Wakamiya, Atsugi, Kanagawa 243-0198, Japan
| | - Takaaki Shimo-Oka
- Graduate School of Engineering Science, Osaka University, 1-3 Machikane-yama, Toyonaka, Osaka 560-8531, Japan
| | - Norikazu Mizuochi
- Graduate School of Engineering Science, Osaka University, 1-3 Machikane-yama, Toyonaka, Osaka 560-8531, Japan
| | - Kae Nemoto
- National Institute of Informatics, 2-1-2 Hitotsubashi, Chiyoda-ku, Tokyo 101-8430, Japan
| | - Kouichi Semba
- 1] NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato-Wakamiya, Atsugi, Kanagawa 243-0198, Japan [2] National Institute of Informatics, 2-1-2 Hitotsubashi, Chiyoda-ku, Tokyo 101-8430, Japan [3]
| | - 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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32
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Maekawa K, Futagami T, Kusunoki Y, Matsuzaki Y, Takikawa H. Identification of a novel HLA-B allele HLA-B*07:185 in a Japanese individual. Tissue Antigens 2013; 82:434-436. [PMID: 24147826 DOI: 10.1111/tan.12223] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/17/2013] [Revised: 08/27/2013] [Accepted: 09/14/2013] [Indexed: 06/02/2023]
Affiliation(s)
- K Maekawa
- Division of Medicinal Safety Science, National Institute of Health Sciences, Tokyo, Japan
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33
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Saito S, Zhu X, Amsüss R, Matsuzaki Y, Kakuyanagi K, Shimo-Oka T, Mizuochi N, Nemoto K, Munro WJ, Semba K. Towards realizing a quantum memory for a superconducting qubit: storage and retrieval of quantum states. Phys Rev Lett 2013; 111:107008. [PMID: 25166702 DOI: 10.1103/physrevlett.111.107008] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/13/2013] [Indexed: 06/03/2023]
Abstract
We have built a hybrid system composed of a superconducting flux qubit (the processor) and an ensemble of nitrogen-vacancy centers in diamond (the memory) that can be directly coupled to one another, and demonstrated how information can be transferred from the flux qubit to the memory, stored, and subsequently retrieved. We have established the coherence properties of the memory and succeeded in creating an entangled state between the processor and memory, demonstrating how the entangled state's coherence is preserved. Our results are a significant step towards using an electron spin ensemble as a quantum memory for superconducting qubits.
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Affiliation(s)
- Shiro Saito
- NTT Basic Research Laboratories, NTT Corporation, 3-1, Morinosato-Wakamiya, Atsugi, Kanagawa 243-0198, Japan
| | - Xiaobo Zhu
- NTT Basic Research Laboratories, NTT Corporation, 3-1, Morinosato-Wakamiya, Atsugi, Kanagawa 243-0198, Japan
| | - Robert Amsüss
- NTT Basic Research Laboratories, NTT Corporation, 3-1, Morinosato-Wakamiya, Atsugi, Kanagawa 243-0198, Japan and Vienna Center for Quantum Science and Technology, Atominstitut, TU Wien, 1020 Vienna, Austria
| | - Yuichiro Matsuzaki
- NTT Basic Research Laboratories, NTT Corporation, 3-1, Morinosato-Wakamiya, Atsugi, Kanagawa 243-0198, Japan
| | - Kosuke Kakuyanagi
- NTT Basic Research Laboratories, NTT Corporation, 3-1, Morinosato-Wakamiya, Atsugi, Kanagawa 243-0198, Japan
| | - Takaaki Shimo-Oka
- Graduate School of Engineering Science, Osaka University, 1-3 Machikane-yama, Toyonaka, Osaka 560-8531, Japan
| | - Norikazu Mizuochi
- Graduate School of Engineering Science, Osaka University, 1-3 Machikane-yama, Toyonaka, Osaka 560-8531, Japan
| | - Kae Nemoto
- National Institute of Informatics, 2-1-2 Hitotsubashi, Chiyoda-ku, Tokyo 101-8430, Japan
| | - William J Munro
- NTT Basic Research Laboratories, NTT Corporation, 3-1, Morinosato-Wakamiya, Atsugi, Kanagawa 243-0198, Japan
| | - Kouichi Semba
- NTT Basic Research Laboratories, NTT Corporation, 3-1, Morinosato-Wakamiya, Atsugi, Kanagawa 243-0198, Japan and National Institute of Informatics, 2-1-2 Hitotsubashi, Chiyoda-ku, Tokyo 101-8430, Japan
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34
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Itagaki T, Suzuki Y, Seto J, Abiko C, Mizuta K, Matsuzaki Y. Two cases of macrolide resistance in Mycoplasma pneumoniae acquired during the treatment period. J Antimicrob Chemother 2012; 68:724-5. [DOI: 10.1093/jac/dks454] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Akasaka E, Matsuzaki Y, Kimura K, Ikenaga S, Takeuchi S, Nakano H, Sawamura D. Normolipidaemic xanthomatosis with systemic involvement of the skin, bone and pharynx. Clin Exp Dermatol 2012; 37:305-7. [DOI: 10.1111/j.1365-2230.2011.04187.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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36
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Fujita K, Seyama T, Sobue T, Matsuzaki Y. Development of Segmented-in-series-type Solid Oxide Fuel Cells for Residential Applications. ACTA ACUST UNITED AC 2012. [DOI: 10.1016/j.egypro.2012.08.049] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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37
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Akasaka E, Nakano H, Nakano A, Toyomaki Y, Takiyoshi N, Rokunohe D, Nishikawa Y, Korekawa A, Matsuzaki Y, Mitsuhashi Y, Sawamura D. Diffuse and focal palmoplantar keratoderma can be caused by a keratin 6c mutation. Br J Dermatol 2011; 165:1290-2. [DOI: 10.1111/j.1365-2133.2011.10552.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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Maeda T, Numakura M, Mashimo Y, Yoshimura N, Kusano J, Ishikawa T, Murata K, Fujita M, Honda A, Kinoshita M, Matsuzaki Y, Teramoto T. 640 NPC1L1 GENE POLYMORPHISMS AFFECTING CHOLESTEROL ABSORPTION. ATHEROSCLEROSIS SUPP 2011. [DOI: 10.1016/s1567-5688(11)70641-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Matsuzaki Y, Ogawa-Ohnishi M, Mori A, Matsubayashi Y. Secreted Peptide Signals Required for Maintenance of Root Stem Cell Niche in Arabidopsis. Science 2010; 329:1065-7. [DOI: 10.1126/science.1191132] [Citation(s) in RCA: 312] [Impact Index Per Article: 22.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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40
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Maeda T, Honda A, Mashimo Y, Takeoka Y, Yasuda D, Yoshimura N, Kusano J, Tsukamoto K, Ishikawa T, Kinoshita M, Matsuzaki Y, Teramoto T. MS14 SEX DIFFERENCES IN EFFECTS OF NPC1L1 GENE POLYMORPHISM ON CHOLESTEROL ABSORPTION. ATHEROSCLEROSIS SUPP 2010. [DOI: 10.1016/s1567-5688(10)70515-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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41
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Aoki Y, Suto A, Mizuta K, Ahiko T, Osaka K, Matsuzaki Y. Duration of norovirus excretion and the longitudinal course of viral load in norovirus-infected elderly patients. J Hosp Infect 2010; 75:42-6. [DOI: 10.1016/j.jhin.2009.12.016] [Citation(s) in RCA: 67] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2009] [Accepted: 12/07/2009] [Indexed: 11/26/2022]
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42
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Takeuchi S, Nakano H, Daiki R, Akasaka E, Nishizawa A, Matsuzaki Y, Sawamura D. Disseminated lupus vulgaris diagnosed more than 63 years after onset due to early misdiagnosis as a port-wine stain. Clin Exp Dermatol 2010; 35:e28-9. [DOI: 10.1111/j.1365-2230.2009.03449.x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Matsuzaki Y, Benjamin SC, Fitzsimons J. Probabilistic growth of large entangled states with low error accumulation. Phys Rev Lett 2010; 104:050501. [PMID: 20366753 DOI: 10.1103/physrevlett.104.050501] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/12/2009] [Indexed: 05/29/2023]
Abstract
The creation of complex entangled states, resources that enable quantum computation, can be achieved via simple "probabilistic" operations which are individually likely to fail. However, typical proposals exploiting this idea carry a severe overhead in terms of the accumulation of errors. Here, we describe a method that can rapidly generate large entangled states with an error accumulation that depends only logarithmically on the failure probability. We find that the approach may be practical for success rates in the sub-10% range. The assumptions that we make, including parallelism and high connectivity, are appropriate for real systems including those based on measurement-induced entanglement. This result therefore indicates the feasibility of such devices.
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Takiyoshi N, Nakano H, Matsuzaki Y, Aizu T, Kaneko T, Rokunohe D, Akasaka E, Jin K, Sawamura D, Ohara K. An eclipse in the subungual space: a diagnostic sign for a subungual epidermal cyst? Br J Dermatol 2009; 161:962-3. [PMID: 19681855 DOI: 10.1111/j.1365-2133.2009.09393.x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Mizuta K, Aoki Y, Suto A, Ootani K, Katsushima N, Itagaki T, Ohmi A, Okamoto M, Nishimura H, Matsuzaki Y, Hongo S, Sugawara K, Shimizu H, Ahiko T. Cross-antigenicity among EV71 strains from different genogroups isolated in Yamagata, Japan, between 1990 and 2007. Vaccine 2009; 27:3153-8. [DOI: 10.1016/j.vaccine.2009.03.060] [Citation(s) in RCA: 80] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2008] [Revised: 03/16/2009] [Accepted: 03/23/2009] [Indexed: 10/20/2022]
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Oshima H, Matsuzaki Y, Takeuchi S, Nakano H, Sawamura D. CD20+ primary cutaneous T-cell lymphoma presenting as a solitary extensive plaque. Br J Dermatol 2009; 160:894-6. [PMID: 19239471 DOI: 10.1111/j.1365-2133.2009.09045.x] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Matsuzaki Y, Chiba T, Hadama T, Asaoka H, Doy M, Shoda J, Tanaka N, Kinoshita M. HBV genome integration and genetic instability in HBsAg-negative and anti-HCV-positive hepatocellular carcinoma in Japan. Cancer Lett 2008; 119:53-61. [PMID: 18372522 DOI: 10.1016/s0304-3835(97)00249-8] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
The aim of this study is to clarify the existence and the form of HCV RNA and HBV DNA genome integration and genetic instability in liver tissue with HBsAg-negative and anti-HCV-positive HCC. We investigated 16 Japanese patients with HBsAg-negative and anti-HCV-positive HCC. HBV genome integration into host cell genome by Southern hybridization and PCR was examined. Moreover, we analyzed loss of heterozygosity (LOH) and replication errors (RER) of chromosomes 2p, 3p and 17p using the PCR and an autosequencer to determine the three microsatellite regions D2S123, D3S1067, TP53. Eight (50.0%) of 16 were found to have integrated genome of HBV in tumor tissue (T) by PCR. In even the non-tumor regions (NT), seven patients (43.8%) were found to have HBV genome integration. The coincidence between T and NT was found in 4 (25%). Integration of HBV-X gene in T was revealed in three (18.7%), and HBV-integration was confirmed in all NT. No integration of the X gene alone was found in the liver tissue. Five (37.5%) of eight HBV DNA integrated cases simultaneously had HCV RNA minus strand. Concerning the genetic instability, RER were detected in two of 16 (12.5%). RER at 2p; D2S123 was observed in one of 16 (6.2%) and at 3p; D3S1067 was observed in one (6.2%). LOH at the D2S123 locus was observed in one of 12 tumors with heterozygosity (8.3%). There was no genetic instability (LOH or RER) of TP53 which was p53 locus on 17p in T. There was only one case of eight HBV DNA integrated cases (6.2%) with genetic instability of RER of 3p simultaneously in T. In conclusion, the majority of HBsAg-negative and anti-HCV-positive HCC liver tissue was found to have HCV-RNA and HBV DNA integration, and in some samples, HBV DNA integration and genetic instability were concurrently confirmed. It is speculated that multistep carcinogenesis may have been proposed for HCC oncogenetic progression.
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Affiliation(s)
- Y Matsuzaki
- Department of Medicine, Institute of Clinical Medicine, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305, Japan
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Abstract
The radiological modalities that are currently utilized as critical components in clinical medicine have also been adapted to small-animal imaging, among which are ultrasound imaging, X-ray computerized tomography (CT), magnetic resonance imaging (MRI), positron emission tomography (PET), and single-photon emission computed tomography (SPECT). Optical imaging techniques such as bioluminescence imaging (BLI) and fluorescence imaging (FLI) are approaches that are commonly used in small animals. Longitudinal surveys of living (i.e., nonsacrificed) animal models with these modalities provide some clues for the development of clinical applications. The techniques are absolutely essential for translational research. However, there are currently few tools available with sufficient spatial or temporal resolution ideal for all experimental studies. In this chapter, we provide a rationale and techniques for visualizing target cells in living small animals and an overview of the advantages and limitations of current imaging technology. Finally, we introduce a humanized mouse and a novel in vivo imaging system that we have developed. We also discuss real-time observations of reconstructs and clinical manifestations.
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Affiliation(s)
- H Masuda
- Department of Obstetrics and Gynecology, Keio University School of Medicine, 35 Shinanomachi, Shinjuku-ku, Tokyo 160-8582, Japan.
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Abstract
The mortality and morbidity of esophageal anastomotic leaks or perforations remain high. We performed retrograde transanastomotic esophageal sump tube drainages for esophageal anastomotic leak or perforation in three patients. Our method is a modified procedure of the T-tube drainage. The Levin gastric tube was simply inserted into the esophagus via anastomotic leak or perforation to develop a defined fistula. All three patients were treated with a satisfactory outcome. An advantage of this method is that it is technically easy, and available for patients whose diseases are difficult to treat with standard T-tube drainage. In addition, one of our patients was successfully managed non-operatively by fluoroscopical guidance. This retrograde esophageal sump tube drainage was technically very easy, safe and useful for esophageal anastomotic leaks or perforations.
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Affiliation(s)
- M Tomita
- Department of Surgery II, Faculty of Medicine, University of Miyazaki, Kihara 5200, Kiyotake, Miyazaki, 889-1692, Japan.
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Abiko C, Mizuta K, Itagaki T, Katsushima N, Ito S, Matsuzaki Y, Okamoto M, Nishimura H, Aoki Y, Murata T, Hoshina H, Hongo S, Ootani K. Outbreak of human metapneumovirus detected by use of the Vero E6 cell line in isolates collected in Yamagata, Japan, in 2004 and 2005. J Clin Microbiol 2007; 45:1912-9. [PMID: 17460056 PMCID: PMC1933089 DOI: 10.1128/jcm.01251-06] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
A number of epidemiological studies have shown human metapneumovirus (hMPV) to be one of the most important viral agents associated with acute respiratory infections in humans. However, due to the difficulty in growing the virus, all epidemiological studies of hMPV infection have been performed on the basis of the molecular method. Thus, the development of a cell line suitable for the isolation of hMPV from clinical specimens is a crucial step for further research. Using the Vero E6 cell line, which could be stably maintained for 1 month without passage or medium change, we succeeded in isolating 79 strains from 4,112 specimens obtained in Yamagata, Japan, in 2004 and 2005. The total isolation rate was 1.9% (79/4,112). The monthly distribution revealed that hMPV infections occurred between February and April in 2004 and throughout most of the year in 2005. Phylogenetic analysis indicated that subgenogroup B2 was predominant in 2004, whereas three subgenogroups, A2, B1, and B2, had cocirculated in 2005. Although multiple subgenogroups cocirculated in 2005, each individual subgenogroup strain was found to predominate at specific sites. An infectivity assay of hMPV strains also indicated that the infection efficiency in Vero E6 cells was better than that in LLC-MK2 cells. Finally, we found that Vero E6 cells are useful for the isolation of hMPVs and that this utility might aid further research into hMPVs beyond the epidemiological data shown in this study.
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Affiliation(s)
- C Abiko
- Department of Microbiology, Yamagata Prefectural Institute of Public Health, Tokamachi, Yamagata 990-0031, Japan
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