1
|
Diekmann O, Krimer DO, Rotter S. Ultrafast Excitation Exchange in a Maxwell Fish-Eye Lens. PHYSICAL REVIEW LETTERS 2024; 132:013602. [PMID: 38242659 DOI: 10.1103/physrevlett.132.013602] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/24/2023] [Accepted: 11/30/2023] [Indexed: 01/21/2024]
Abstract
The strong coupling of quantum emitters to a cavity mode has been of paramount importance in the development of quantum optics. Recently, also the strong coupling to more than a single mode of an electromagnetic resonator has drawn considerable interest. We investigate how this multimode strong coupling regime can be harnessed to coherently control quantum systems. Specifically, we demonstrate that a Maxwell fish-eye lens can be used to implement a pulsed excitation exchange between two distant quantum emitters. This periodic exchange is mediated by single-photon pulses and can be extended to a photon-exchange between two atomic ensembles, for which the coupling strength is enhanced collectively.
Collapse
Affiliation(s)
- Oliver Diekmann
- Institute for Theoretical Physics, Vienna University of Technology (TU Wien), Vienna A-1040, Austria
| | - Dmitry O Krimer
- Institute for Theoretical Physics, Vienna University of Technology (TU Wien), Vienna A-1040, Austria
| | - Stefan Rotter
- Institute for Theoretical Physics, Vienna University of Technology (TU Wien), Vienna A-1040, Austria
| |
Collapse
|
2
|
Lin WJ, Lu Y, Wen PY, Cheng YT, Lee CP, Lin KT, Chiang KH, Hsieh MC, Chen CY, Chien CH, Lin JJ, Chen JC, Lin YH, Chuu CS, Nori F, Frisk Kockum A, Lin GD, Delsing P, Hoi IC. Deterministic Loading of Microwaves onto an Artificial Atom Using a Time-Reversed Waveform. NANO LETTERS 2022; 22:8137-8142. [PMID: 36200986 PMCID: PMC9615994 DOI: 10.1021/acs.nanolett.2c02578] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/30/2022] [Revised: 09/28/2022] [Indexed: 06/16/2023]
Abstract
Loading quantum information deterministically onto a quantum node is an important step toward a quantum network. Here, we demonstrate that coherent-state microwave photons with an optimal temporal waveform can be efficiently loaded onto a single superconducting artificial atom in a semi-infinite one-dimensional (1D) transmission-line waveguide. Using a weak coherent state (the number of photons (N) contained in the pulse ≪1) with an exponentially rising waveform, whose time constant matches the decoherence time of the artificial atom, we demonstrate a loading efficiency of 94.2% ± 0.7% from 1D semifree space to the artificial atom. The high loading efficiency is due to time-reversal symmetry: the overlap between the incoming wave and the time-reversed emitted wave is up to 97.1% ± 0.4%. Our results open up promising applications in realizing quantum networks based on waveguide quantum electrodynamics.
Collapse
Affiliation(s)
- Wei-Ju Lin
- Department
of Physics, National Tsing Hua University, Hsinchu30013, Taiwan
| | - Yong Lu
- Department
of Microtechnology and Nanoscience (MC2), Chalmers University of Technology, SE-412 96Gothenburg, Sweden
- 3rd
Institute of Physics, IQST, and Research Centre SCoPE, University of Stuttgart, Stuttgart70049, Germany
| | - Ping Yi Wen
- Department
of Physics, National Chung Cheng University, Chiayi621301, Taiwan
| | - Yu-Ting Cheng
- Department
of Physics, National Tsing Hua University, Hsinchu30013, Taiwan
| | - Ching-Ping Lee
- Department
of Physics, National Tsing Hua University, Hsinchu30013, Taiwan
| | - Kuan Ting Lin
- CQSE,
Department of Physics, National Taiwan University, Taipei10617, Taiwan
| | - Kuan Hsun Chiang
- Department
of Physics, National Central University, Jhongli32001, Taiwan
| | - Ming Che Hsieh
- Department
of Physics, National Tsing Hua University, Hsinchu30013, Taiwan
| | - Ching-Yeh Chen
- Department
of Physics, National Tsing Hua University, Hsinchu30013, Taiwan
| | - Chin-Hsun Chien
- Department
of Physics, National Tsing Hua University, Hsinchu30013, Taiwan
| | - Jia Jhan Lin
- Department
of Physics, National Tsing Hua University, Hsinchu30013, Taiwan
| | - Jeng-Chung Chen
- Department
of Physics, National Tsing Hua University, Hsinchu30013, Taiwan
- Center
for Quantum Technology, National Tsing Hua
University, Hsinchu30013, Taiwan
| | - Yen Hsiang Lin
- Department
of Physics, National Tsing Hua University, Hsinchu30013, Taiwan
- Center
for Quantum Technology, National Tsing Hua
University, Hsinchu30013, Taiwan
| | - Chih-Sung Chuu
- Department
of Physics, National Tsing Hua University, Hsinchu30013, Taiwan
- Center
for Quantum Technology, National Tsing Hua
University, Hsinchu30013, Taiwan
| | - Franco Nori
- Theoretical
Quantum Physics Laboratory, RIKEN Cluster
for Pioneering Research, Wako-shi, Saitama351-0198, Japan
- Physics
Department, The University of Michigan, Ann Arbor, Michigan48109-1040, United States
| | - Anton Frisk Kockum
- Department
of Microtechnology and Nanoscience (MC2), Chalmers University of Technology, SE-412 96Gothenburg, Sweden
| | - Guin Dar Lin
- CQSE,
Department of Physics, National Taiwan University, Taipei10617, Taiwan
- Physics
Division, National Center for Theoretical
Sciences, Taipei10617, Taiwan
- Trapped-Ion
Quantum Computing Laboratory, Hon Hai Research
Institute, Taipei11492, Taiwan
| | - Per Delsing
- Department
of Microtechnology and Nanoscience (MC2), Chalmers University of Technology, SE-412 96Gothenburg, Sweden
| | - Io-Chun Hoi
- Department
of Physics, National Tsing Hua University, Hsinchu30013, Taiwan
- Department
of Physics, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong SAR999077, China
| |
Collapse
|
3
|
Maffei M, Camati PA, Auffèves A. Closed-System Solution of the 1D Atom from Collision Model. ENTROPY (BASEL, SWITZERLAND) 2022; 24:151. [PMID: 35205447 PMCID: PMC8871359 DOI: 10.3390/e24020151] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/16/2021] [Revised: 01/12/2022] [Accepted: 01/12/2022] [Indexed: 02/04/2023]
Abstract
Obtaining the total wavefunction evolution of interacting quantum systems provides access to important properties, such as entanglement, shedding light on fundamental aspects, e.g., quantum energetics and thermodynamics, and guiding towards possible application in the fields of quantum computation and communication. We consider a two-level atom (qubit) coupled to the continuum of travelling modes of a field confined in a one-dimensional chiral waveguide. Originally, we treated the light-matter ensemble as a closed, isolated system. We solve its dynamics using a collision model where individual temporal modes of the field locally interact with the qubit in a sequential fashion. This approach allows us to obtain the total wavefunction of the qubit-field system, at any time, when the field starts in a coherent or a single-photon state. Our method is general and can be applied to other initial field states.
Collapse
Affiliation(s)
- Maria Maffei
- CNRS, Grenoble INP, Institut Néel, Université Grenoble Alpes, 38000 Grenoble, France; (P.A.C.); (A.A.)
| | | | | |
Collapse
|
4
|
Bruno N, Bianchet LC, Prakash V, Li N, Alves N, Mitchell MW. Maltese cross coupling to individual cold atoms in free space. OPTICS EXPRESS 2019; 27:31042-31052. [PMID: 31684344 DOI: 10.1364/oe.27.031042] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/05/2019] [Accepted: 10/01/2019] [Indexed: 06/10/2023]
Abstract
We report on the simultaneous observation from four directions of the fluorescence of single 87Rb atoms trapped at the common focus of four high numerical aperture (NA=0.5) aspheric lenses. We use an interferometrically-guided pick-and-place technique to precisely and stably position the lenses along the four cardinal directions with their foci at a single central point. The geometry gives right angle access to a single quantum emitter, and will enable new trapping, excitation, and collection methods. The fluorescence signals indicate both sub-Poissonian atom number statistics and photon anti-bunching, showing suitability for cold atom quantum optics.
Collapse
|
5
|
Paudel U, Wong JJ, Goggin M, Kwiat PG, Bracker AS, Yakes M, Gammon D, Steel DG. Direct excitation of a single quantum dot with cavity-SPDC photons. OPTICS EXPRESS 2019; 27:16308-16319. [PMID: 31163810 DOI: 10.1364/oe.27.016308] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/17/2018] [Accepted: 05/02/2019] [Indexed: 06/09/2023]
Abstract
The ability to generate mode-engineered single photons to interface with disparate quantum systems is of importance for building a quantum network. Here we report on the generation of a pulsed, heralded single photon source with a sub-GHz spectral bandwidth that couples to indium arsenide quantum dots centered at 942 nm. The source is built with a type-II PPKTP down-conversion crystal embedded in a semi-confocal optical cavity and pumped with a 76 MHz repetition rate pulsed laser to emit collinear, polarization-correlated photon pairs resonant with a single quantum dot. In order to demonstrate direct coupling, we use the mode-engineered cavity-SPDC single-photon source to resonantly excite an isolated single quantum dot.
Collapse
|
6
|
Lou X, Yuan Z, Dong Y. Rapid spectroscopic gas sensing using optical linear chirp chain. OPTICS EXPRESS 2019; 27:13160-13171. [PMID: 31052845 DOI: 10.1364/oe.27.013160] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/10/2019] [Accepted: 04/18/2019] [Indexed: 06/09/2023]
Abstract
Spectroscopic gas analysis for monitoring transient events in fast processes requires high spectrum acquisition rate with low uncertainty; however, so far high-speed spectroscopic gas detection with sufficient spectral resolution and spectral span is still challenging. Here, we propose an innovative method based on optical linear chirp chain (OLCC) for rapid acquisition of high-resolution gas spectra with a rate up to the order of MHz with 100% duty cycle, spectral resolution at 10-MHz level and spectral span > 20 GHz. The OLCC is generated by high-speed optical modulation driven by a digital arbitrary waveform generator in combination with a four-wave-mixing process, exhibiting a highly linear frequency chirp (linearity error of ~10-4) and low level of residual amplitude modulation (<1%). An image denoising method based on nonlocal means algorithm is exploited to reduce the high-frequency noise while guaranteeing the response time and spectral resolution. We demonstrate this method by monitoring a fast charging process of acetylene gas into a vacuumized gas cell, clearly unfolding gas pressure oscillations at μs time scale. Our proposed OLCC-based spectroscopic method opens up prospects for the development of high-speed spectrometers and optical sensors.
Collapse
|
7
|
Valente D, Brito F, Werlang T. Dynamic Stark shift induced by a single photon packet. OPTICS LETTERS 2017; 42:1692-1695. [PMID: 28454137 DOI: 10.1364/ol.42.001692] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The dynamic Stark shift results from the interaction of an atom with the electromagnetic field. We show how a propagating single-photon wave packet can induce a time-dependent dynamical Stark shift on a two-level system (TLS). A non-perturbative fully quantum treatment is employed, where the quantum dynamics of both the field and the TLS are analyzed. We also provide the means to experimentally access such time-dependent frequency by measuring the interference pattern in the electromagnetic field inside a 1D waveguide. The effect we evidence here may find applications in the autonomous quantum control of quantum systems without classical external fields, which can be useful for quantum information processing as well as for quantum thermodynamical tasks.
Collapse
|
8
|
Leong V, Seidler MA, Steiner M, Cerè A, Kurtsiefer C. Time-resolved scattering of a single photon by a single atom. Nat Commun 2016; 7:13716. [PMID: 27897173 PMCID: PMC5141341 DOI: 10.1038/ncomms13716] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2016] [Accepted: 10/25/2016] [Indexed: 11/16/2022] Open
Abstract
Scattering of light by matter has been studied extensively in the past. Yet, the most fundamental process, the scattering of a single photon by a single atom, is largely unexplored. One prominent prediction of quantum optics is the deterministic absorption of a travelling photon by a single atom, provided the photon waveform matches spatially and temporally the time-reversed version of a spontaneously emitted photon. Here we experimentally address this prediction and investigate the influence of the photon's temporal profile on the scattering dynamics using a single trapped atom and heralded single photons. In a time-resolved measurement of atomic excitation we find a 56(11)% increase of the peak excitation by photons with an exponentially rising profile compared with a decaying one. However, the overall scattering probability remains unchanged within the experimental uncertainties. Our results demonstrate that envelope tailoring of single photons enables precise control of the photon–atom interaction. The efficient excitation of atoms using photons is a fundamental step in the control of photon-atom interaction and quantum information protocols. Here the authors show that photons with an exponentially rising envelope excite a single atom efficiently compared to a decaying temporal shape.
Collapse
Affiliation(s)
- Victor Leong
- Centre for Quantum Technologies, National University of Singapore, 3 Science Drive 2, Singapore 117543, Singapore.,Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore 117542, Singapore
| | - Mathias Alexander Seidler
- Centre for Quantum Technologies, National University of Singapore, 3 Science Drive 2, Singapore 117543, Singapore
| | - Matthias Steiner
- Centre for Quantum Technologies, National University of Singapore, 3 Science Drive 2, Singapore 117543, Singapore.,Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore 117542, Singapore
| | - Alessandro Cerè
- Centre for Quantum Technologies, National University of Singapore, 3 Science Drive 2, Singapore 117543, Singapore
| | - Christian Kurtsiefer
- Centre for Quantum Technologies, National University of Singapore, 3 Science Drive 2, Singapore 117543, Singapore.,Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore 117542, Singapore
| |
Collapse
|
9
|
Generation of single photons with highly tunable wave shape from a cold atomic ensemble. Nat Commun 2016; 7:13556. [PMID: 27886166 PMCID: PMC5133620 DOI: 10.1038/ncomms13556] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2016] [Accepted: 10/13/2016] [Indexed: 11/09/2022] Open
Abstract
The generation of ultra-narrowband, pure and storable single photons with widely tunable wave shape is an enabling step toward hybrid quantum networks requiring interconnection of remote disparate quantum systems. It allows interaction of quantum light with several material systems, including photonic quantum memories, single trapped ions and opto-mechanical systems. Previous approaches have offered a limited tuning range of the photon duration of at most one order of magnitude. Here we report on a heralded single photon source with controllable emission time based on a cold atomic ensemble, which can generate photons with temporal durations varying over three orders of magnitude up to 10 μs without a significant change of the readout efficiency. We prove the nonclassicality of the emitted photons, show that they are emitted in a pure state, and demonstrate that ultra-long photons with nonstandard wave shape can be generated, which are ideally suited for several quantum information tasks. Generation of narrowband pure and storable single photons is an enabling step towards hybrid quantum networks interconnecting different systems. Here the authors report on a heralded single photon source based on a cold ensemble of atoms with controllable emission time and high photon shape tunability.
Collapse
|
10
|
Valente D, Arruda MFZ, Werlang T. Non-Markovianity induced by a single-photon wave packet in a one-dimensional waveguide. OPTICS LETTERS 2016; 41:3126-3129. [PMID: 27367118 DOI: 10.1364/ol.41.003126] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The concept of non-Markovianity (NM) in quantum dynamics is still an open debate. Understanding how to generate and measure NM in specific models may aid in this quest. In quantum optics, an engineered electromagnetic environment coupled to a single atom can induce NM. The most common scenario of structured electromagnetic environment is an optical cavity, composed by a pair of mirrors. Here, we show how to generate and measure NM on a two-level system coupled to a one-dimensional waveguide with no mirrors required. The origin of the non-Markovian behavior lies in the initial state of the field, prepared as a single-photon packet. NM is shown to depend on two experimentally controllable parameters, namely, the linewidth of the packet and its central frequency. We relate the presence of NM to quantum interference. We also show how the two output channels of the waveguide provide distinct signatures of NM, both experimentally accessible.
Collapse
|
11
|
Coherent manipulation of a solid-state artificial atom with few photons. Nat Commun 2016; 7:11986. [PMID: 27312189 PMCID: PMC4915012 DOI: 10.1038/ncomms11986] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2016] [Accepted: 05/18/2016] [Indexed: 11/08/2022] Open
Abstract
In a quantum network based on atoms and photons, a single atom should control the photon state and, reciprocally, a single photon should allow the coherent manipulation of the atom. Both operations require controlling the atom environment and developing efficient atom-photon interfaces, for instance by coupling the natural or artificial atom to cavities. So far, much attention has been drown on manipulating the light field with atomic transitions, recently at the few-photon limit. Here we report on the reciprocal operation and demonstrate the coherent manipulation of an artificial atom by few photons. We study a quantum dot-cavity system with a record cooperativity of 13. Incident photons interact with the atom with probability 0.95, which radiates back in the cavity mode with probability 0.96. Inversion of the atomic transition is achieved for 3.8 photons on average, showing that our artificial atom performs as if fully isolated from the solid-state environment.
Collapse
|
12
|
Bettles RJ, Gardiner SA, Adams CS. Enhanced Optical Cross Section via Collective Coupling of Atomic Dipoles in a 2D Array. PHYSICAL REVIEW LETTERS 2016; 116:103602. [PMID: 27015480 DOI: 10.1103/physrevlett.116.103602] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/27/2015] [Indexed: 06/05/2023]
Abstract
Enhancing the optical cross section is an enticing goal in light-matter interactions, due to its fundamental role in quantum and nonlinear optics. Here, we show how dipolar interactions can suppress off-axis scattering in a two-dimensional atomic array, leading to a subradiant collective mode where the optical cross section is enhanced by almost an order of magnitude. As a consequence, it is possible to attain an optical depth which implies high-fidelity extinction, from a monolayer. Using realistic experimental parameters, we also model how lattice vacancies and the atomic trapping depth affect the transmission, concluding that such high extinction should be possible, using current experimental techniques.
Collapse
Affiliation(s)
- Robert J Bettles
- Department of Physics, Joint Quantum Center (JQC) Durham-Newcastle, Durham University, South Road, Durham DH1 3LE, United Kingdom
| | - Simon A Gardiner
- Department of Physics, Joint Quantum Center (JQC) Durham-Newcastle, Durham University, South Road, Durham DH1 3LE, United Kingdom
| | - Charles S Adams
- Department of Physics, Joint Quantum Center (JQC) Durham-Newcastle, Durham University, South Road, Durham DH1 3LE, United Kingdom
| |
Collapse
|
13
|
Rogers CE, Gould PL. Nanosecond pulse shaping at 780 nm with fiber-based electro-optical modulators and a double-pass tapered amplifier. OPTICS EXPRESS 2016; 24:2596-2606. [PMID: 26906832 DOI: 10.1364/oe.24.002596] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
We describe a system for generating frequency-chirped and amplitude-shaped pulses on time scales from sub-nanosecond to ten nanoseconds. The system starts with cw diode-laser light at 780 nm and utilizes fiber-based electro-optical phase and intensity modulators, driven by an arbitrary waveform generator, to generate the shaped pulses. These pulses are subsequently amplified to several hundred mW with a tapered amplifier in a delayed double-pass configuration. Frequency chirps up to 5 GHz in 2 ns and pulse widths as short as 0.15 ns have been realized.
Collapse
|
14
|
Srivathsan B, Gulati GK, Cerè A, Chng B, Kurtsiefer C. Reversing the temporal envelope of a heralded single photon using a cavity. PHYSICAL REVIEW LETTERS 2014; 113:163601. [PMID: 25361256 DOI: 10.1103/physrevlett.113.163601] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/31/2014] [Indexed: 06/04/2023]
Abstract
We demonstrate a way to prepare single photons with a temporal envelope that resembles the time reversal of photons from the spontaneous decay process. We use the photon pairs generated from a time-ordered cascade decay: the detection of the first photon of the cascade is used as a herald for the ground-state transition resonant second photon. We show how the interaction of the heralding photon with an asymmetric Fabry-Perot cavity reverses the temporal shape of its twin photon from a decaying to a rising exponential envelope. This single photon is expected to be ideal for interacting with two-level systems.
Collapse
Affiliation(s)
- Bharath Srivathsan
- Centre for Quantum Technologies, National University of Singapore, 3 Science Drive 2, Singapore 117543, Singapore
| | - Gurpreet Kaur Gulati
- Centre for Quantum Technologies, National University of Singapore, 3 Science Drive 2, Singapore 117543, Singapore
| | - Alessandro Cerè
- Centre for Quantum Technologies, National University of Singapore, 3 Science Drive 2, Singapore 117543, Singapore
| | - Brenda Chng
- Centre for Quantum Technologies, National University of Singapore, 3 Science Drive 2, Singapore 117543, Singapore
| | - Christian Kurtsiefer
- Centre for Quantum Technologies and Department of Physics, National University of Singapore, 3 Science Drive 2, Singapore 117543, Singapore
| |
Collapse
|
15
|
Jeffrey E, Sank D, Mutus JY, White TC, Kelly J, Barends R, Chen Y, Chen Z, Chiaro B, Dunsworth A, Megrant A, O'Malley PJJ, Neill C, Roushan P, Vainsencher A, Wenner J, Cleland AN, Martinis JM. Fast accurate state measurement with superconducting qubits. PHYSICAL REVIEW LETTERS 2014; 112:190504. [PMID: 24877923 DOI: 10.1103/physrevlett.112.210501] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/19/2013] [Indexed: 05/23/2023]
Abstract
Faster and more accurate state measurement is required for progress in superconducting qubit experiments with greater numbers of qubits and advanced techniques such as feedback. We have designed a multiplexed measurement system with a bandpass filter that allows fast measurement without increasing environmental damping of the qubits. We use this to demonstrate simultaneous measurement of four qubits on a single superconducting integrated circuit, the fastest of which can be measured to 99.8% accuracy in 140 ns. This accuracy and speed is suitable for advanced multiqubit experiments including surface-code error correction.
Collapse
Affiliation(s)
- Evan Jeffrey
- Department of Physics, University of California, Santa Barbara, California 93106-9530, USA
| | - Daniel Sank
- Department of Physics, University of California, Santa Barbara, California 93106-9530, USA
| | - J Y Mutus
- Department of Physics, University of California, Santa Barbara, California 93106-9530, USA
| | - T C White
- Department of Physics, University of California, Santa Barbara, California 93106-9530, USA
| | - J Kelly
- Department of Physics, University of California, Santa Barbara, California 93106-9530, USA
| | - R Barends
- Department of Physics, University of California, Santa Barbara, California 93106-9530, USA
| | - Y Chen
- Department of Physics, University of California, Santa Barbara, California 93106-9530, USA
| | - Z Chen
- Department of Physics, University of California, Santa Barbara, California 93106-9530, USA
| | - B Chiaro
- Department of Physics, University of California, Santa Barbara, California 93106-9530, USA
| | - A Dunsworth
- Department of Physics, University of California, Santa Barbara, California 93106-9530, USA
| | - A Megrant
- Department of Physics, University of California, Santa Barbara, California 93106-9530, USA
| | - P J J O'Malley
- Department of Physics, University of California, Santa Barbara, California 93106-9530, USA
| | - C Neill
- Department of Physics, University of California, Santa Barbara, California 93106-9530, USA
| | - P Roushan
- Department of Physics, University of California, Santa Barbara, California 93106-9530, USA
| | - A Vainsencher
- Department of Physics, University of California, Santa Barbara, California 93106-9530, USA
| | - J Wenner
- Department of Physics, University of California, Santa Barbara, California 93106-9530, USA
| | - A N Cleland
- Department of Physics, University of California, Santa Barbara, California 93106-9530, USA
| | | |
Collapse
|