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Homomorphic encryption of linear optics quantum computation on almost arbitrary states of light with asymptotically perfect security

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Physical Review Research 2020年第1期2卷 013332-013332页

作者： Yingkai Ouyang Si-Hui Tan Joseph Fitzsimons Peter P. Rohde Department of Physics & Astronomy University of Sheffield Sheffield S3 7RH United Kingdom Singapore University of Technology and Design 8 Somapah Road Singapore 487372 Centre for Quantum Technologies National University of Singapore 3 Science Drive 2 Singapore 117543 Horizon Quantum Computing 79 Ayer Rajah Crescent Singapore 139955 Centre for Quantum Software & Information (QSI) Faculty of Engineering & Information Technology University of Technology Sydney NSW 2007 Australia Hearne Institute for Theoretical Physics and Department of Physics & Astronomy Louisiana State University Baton Rouge Louisiana 70803 United States

Future quantum computers are likely to be expensive and affordable outright by few, motivating client/server models for outsourced computation. However, the applications for quantum computing will often involve sensitive data, and the client would like to keep her data secret, both from eavesdroppers and the server itself. Homomorphic encryption is an approach for encrypted, outsourced quantum computation, where the client's data remains secret, even during execution of the computation. We present a scheme for the homomorphic encryption of arbitrary quantum states of light with no more than a fixed number of photons, under the evolution of both passive and adaptive linear optics, the latter of which is universal for quantum computation. The scheme uses random coherent displacements in phase-space to obfuscate client data. In the limit of large coherent displacements, the protocol exhibits asymptotically perfect information-theoretic secrecy. The experimental requirements are modest, and easily implementable using present-day technology.

关键词： quantum computation quantum cryptography quantum information processing with continuous variables

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Joint Determination of Reactor Antineutrino Spectra from U235 and Pu239 Fission by Daya Bay and PROSPECT

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Physical Review Letters 2022年第8期128卷 081801-081801页

作者： F. P. An M. Andriamirado A. B. Balantekin H. R. Band C. D. Bass D. E. Bergeron D. Berish M. Bishai S. Blyth N. S. Bowden C. D. Bryan G. F. Cao J. Cao J. F. Chang Y. Chang H. S. Chen S. M. Chen Y. Chen Y. X. Chen J. Cheng Z. K. Cheng J. J. Cherwinka M. C. Chu T. Classen A. J. Conant J. P. Cummings O. Dalager G. Deichert A. Delgado F. S. Deng Y. Y. Ding M. V. Diwan T. Dohnal M. J. Dolinski D. Dolzhikov J. Dove M. Dvořák D. A. Dwyer A. Erickson B. T. Foust J. K. Gaison A. Galindo-Uribarri J. P. Gallo C. E. Gilbert M. Gonchar G. H. Gong H. Gong M. Grassi W. Q. Gu J. Y. Guo L. Guo X. H. Guo Y. H. Guo Z. Guo R. W. Hackenburg S. Hans A. B. Hansell M. He K. M. Heeger B. Heffron Y. K. Heng Y. K. Hor Y. B. Hsiung B. Z. Hu J. R. Hu T. Hu Z. J. Hu H. X. Huang J. H. Huang X. T. Huang Y. B. Huang P. Huber J. Koblanski D. E. Jaffe S. Jayakumar K. L. Jen X. L. Ji X. P. Ji R. A. Johnson D. C. Jones L. Kang S. H. Kettell S. Kohn M. Kramer O. Kyzylova C. E. Lane T. J. Langford J. LaRosa J. Lee J. H. C. Lee R. T. Lei R. Leitner J. K. C. Leung F. Li H. L. Li J. J. Li Q. J. Li R. H. Li S. Li S. C. Li W. D. Li X. N. Li X. Q. Li Y. F. Li Z. B. Li H. Liang C. J. Lin G. L. Lin S. Lin J. J. Ling J. M. Link L. Littenberg B. R. Littlejohn J. C. Liu J. L. Liu J. X. Liu C. Lu H. Q. Lu X. Lu K. B. Luk B. Z. Ma X. B. Ma X. Y. Ma Y. Q. Ma R. C. Mandujano J. Maricic C. Marshall K. T. McDonald R. D. McKeown M. P. Mendenhall Y. Meng A. M. Meyer R. Milincic P. E. Mueller H. P. Mumm J. Napolitano D. Naumov E. Naumova R. Neilson T. M. T. Nguyen J. A. Nikkel S. Nour J. P. Ochoa-Ricoux A. Olshevskiy J. L. Palomino H.-R. Pan J. Park S. Patton J. C. Peng C. S. J. Pun D. A. Pushin F. Z. Qi M. Qi X. Qian N. Raper J. Ren C. Morales Reveco R. Rosero B. Roskovec X. C. Ruan M. Searles H. Steiner J. L. Sun P. T. Surukuchi T. Tmej K. Treskov W.-H. Tse C. E. Tull M. A. Tyra R. L. Varner D. Venegas-Vargas B. Viren V. Vorobel C. H. Wang J. Wang M. Wang N. Y. Wang R. G. Wang W. Wang X. Wang Y. Wang Y. F. Wang Z. Wang Z. M. Wang P. B. Weatherly H. Y. Wei L. H. Wei L. J Institute of Modern Physics East China University of Science and Technology Shanghai Department of Physics Illinois Institute of Technology Chicago Illinois Department of Physics University of Wisconsin Madison Madison Wisconsin Wright Laboratory Department of Physics Yale University New Haven Connecticut Department of Physics Le Moyne College Syracuse New York National Institute of Standards and Technology Gaithersburg Maryland Department of Physics Temple University Philadelphia Pennsylvania Brookhaven National Laboratory Upton New York Department of Physics National Taiwan University Taipei Nuclear and Chemical Sciences Division Lawrence Livermore National Laboratory Livermore California High Flux Isotope Reactor Oak Ridge National Laboratory Oak Ridge Tennessee Institute of High Energy Physics Beijing National United University Miao-Li Department of Engineering Physics Tsinghua University Beijing Shenzhen University Shenzhen Sun Yat-Sen (Zhongshan) University Guangzhou North China Electric Power University Beijing Chinese University of Hong Kong Hong Kong Siena College Loudonville New York 12211 Department of Physics and Astronomy University of California Irvine California 92697 Physics Division Oak Ridge National Laboratory Oak Ridge Tennessee Department of Physics and Astronomy University of Tennessee Knoxville Tennessee University of Science and Technology of China Hefei Charles University Faculty of Mathematics and Physics Prague Czech Republic Department of Physics Drexel University Philadelphia Pennsylvania Joint Institute for Nuclear Research Dubna Moscow Region Russia Department of Physics University of Illinois at Urbana-Champaign Urbana Illinois 61801 Lawrence Berkeley National Laboratory Berkeley California 94720 George W. Woodruff School of Mechanical Engineering Georgia Institute of Technology Atlanta Georgia Beijing Normal University Beijing Department of Nuclear Science and Technology School of Energy and Power Engineering X

A joint determination of the reactor antineutrino spectra resulting from the fission of U235 and Pu239 has been carried out by the Daya Bay and PROSPECT Collaborations. This Letter reports the level of consistency of U235 spectrum measurements from the two experiments and presents new results from a joint analysis of both data sets. The measurements are found to be consistent. The combined analysis reduces the degeneracy between the dominant U235 and Pu239 isotopes and improves the uncertainty of the U235 spectral shape to about 3%. The U235 and Pu239 antineutrino energy spectra are unfolded from the jointly deconvolved reactor spectra using the Wiener-SVD unfolding method, providing a data-based reference for other reactor antineutrino experiments and other applications. This is the first measurement of the U235 and Pu239 spectra based on the combination of experiments at low- and highly enriched uranium reactors.

关键词： Neutrino interactions Nuclear reactors Neutrinos Neutrino detectors

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Role of dephasing on the conductance signatures of Majorana zero modes

arXiv

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arXiv 2021年

作者： Duse, Chaitrali Sriram, Praveen Gharavi, Kaveh Baugh, Jonathan Muralidharan, Bhaskaran Department of Physics Indian Institute of Technology Bombay Powai Mumbai400076 India Department of Applied Physics Stanford University 348 Via Pueblo StanfordCA94305 United States Institute for Quantum Computing University of Waterloo WaterlooONN2L 3G1 Canada Department of Physics and Astronomy University of Waterloo WaterlooONN2L 3G1 Canada Department of Chemistry University of Waterloo WaterlooONN2L 3G1 Canada Department of Electrical Engineering Indian Institute of Technology Bombay Powai Mumbai400076 India

Conductance signatures that signal the presence of Majorana zero modes in a three terminal nanowire-topological superconductor hybrid system are analyzed in detail, in both the clean nanowire limit and in the presence of non-coherent dephasing interactions. In the coherent transport regime for a clean wire, we point out contributions of the local Andreev reflection and the non-local transmissions toward the total conductance lineshapes while clarifying the role of contact broadening on the Majorana conductance lineshapes at the magnetic field parity crossings. Interestingly, at larger B-field parity crossings, the contribution of the Andreev reflection process decreases which is compensated by the non-local processes in order to maintain the conductance quantum regardless of contact coupling strength. In the non-coherent transport regime, we include dephasing that is introduced by momentum randomization processes, that allows one to smoothly transition to the diffusive limit. Here, as expected, we note that while the Majorana character of the zero modes is unchanged, there is a reduction in the conductance peak magnitude that scales with the strength of the impurity scattering potentials. Important distinctions between the effect of non-coherent dephasing processes and contact-induced tunnel broadenings in the coherent regime on the conductance lineshapes are elucidated. Most importantly our results reveal that the addition of dephasing in the set up does not lead to any notable length dependence to the conductance of the zero modes, contrary to what one would expect in a gradual transition to the diffusive limit. We believe this work paves a way for a systematic introduction of scattering processes into the realistic modeling of Majorana nanowire hybrid devices and assessing topological signatures in such systems in the presence of non-coherent scattering processes. © 2021, CC BY.

关键词： Nanowires

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Gate-tunable intrinsic anomalous hall effect in epitaxial MnBi2Te4 films

arXiv

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arXiv 2021年

作者： Liu, Shanshan Yu, Jiexiang Zhang, Enze Li, Zihan Sun, Qiang Zhang, Yong Li, Lun Zhao, Minhao Leng, Pengliang Cao, Xiangyu Zou, Jin Kou, Xufeng Zang, Jiadong Xiu, Faxian State Key Laboratory of Surface Physics Department of Physics Fudan University Shanghai200433 China Shanghai Qi Zhi Institute 41th Floor AI Tower No. 701 Yunjin Road Xuhui District Shanghai200232 China School of Physical Science and Technology Soochow University Suzhou215006 China Materials Engineering The University of Queensland BrisbaneQLD4072 Australia School of Information Science and Technology ShanghaiTech University Shanghai201210 China Centre for Microscopy and Microanalysis The University of Queensland BrisbaneQLD4072 Australia Department of Physics and Astronomy University of New Hampshire DurhamNH03824 United States Institute for Nanoelectronic Devices and Quantum Computing Fudan University Shanghai200433 China Shanghai Research Center for Quantum Sciences Shanghai201315 China

Anomalous Hall effect (AHE) is an important transport signature revealing topological properties of magnetic materials and their spin textures. Recently, antiferromagnetic MnBi2Te4 has been demonstrated to be an intrinsic magnetic topological insulator that exhibits quantum AHE in exfoliated nanoflakes. However, its complicated AHE behaviors may offer an opportunity for the unexplored correlation between magnetism and band structure. Here, we show the Berry curvature dominated intrinsic AHE in wafer-scale MnBi2Te4 thin films. By utilizing a high-dielectric SrTiO3 as the back-gate, we unveil an ambipolar conduction and electron-hole carrier (n-p) transition in ~7 septuple layer MnBi2Te4. A quadratic relation between the saturated AHE resistance and longitudinal resistance suggests its intrinsic AHE mechanism. For ~3 septuple layer MnBi2Te4, however, the AHE reverses its sign from pristine negative to positive under the electric-gating. The first-principles calculations demonstrate that such behavior is due to the competing Berry curvature between polarized spin-minority-dominated surface states and spin-majority-dominated inner-bands. Our results shed light on the physical mechanism of the gate-tunable intrinsic AHE in MnBi2Te4 thin films and provide a feasible approach to engineering its AHE. © 2021, CC0.

关键词： Textures

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Generic detection-based error-mitigation using quantum autoencoders

arXiv

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arXiv 2020年

作者： Zhang, Xiao-Ming Kong, Weicheng Farooq, Muhammad Usman Yung, Man-Hong Guo, Guoping Wang, Xin Department of Physics City University of Hong Kong Tat Chee Avenue Kowloon Hong Kong Origin Quantum Computing Company Limited Hefei Anhui230088 China Department of Mathematics City University of Hong Kong Tat Chee Avenue Kowloon Hong Kong Shenzhen Institute for Quantum Science and Engineering Department of Physics Southern University of Science and Technology Shenzhen518055 China Shenzhen Key Laboratory of Quantum Science and Engineering Southern University of Science and Technology Shenzhen518055 China CAS Key Laboratory of Quantum Information University of Science and Technology of China Hefei Anhui230026 China City University of Hong Kong Shenzhen Research Institute Shenzhen Guangdong518057 China

Efficient error-mitigation techniques demanding minimal resources is key to quantum information processing. We propose a generic protocol to mitigate quantum errors using detection-based quantum autoencoders. In our protocol, the quantum data are compressed into a latent subspace while leaving errors outside, the latter of which is then removed by a measurement and post-selection. Compared to previously developed methods, our protocol on the one hand requires no extra qubits, and on the other hand has a near-optimal denoising power, in which under reasonable requirements all errors detected outside of the latent subspace can be removed, while those inside the subspace cannot be removed by any means. Our detection-based quantum autoencoders are therefore particularly useful for near-term quantum devices in which controllable qubits are limited while noise reduction is important. Copyright © 2020, The Authors. All rights reserved.

关键词： Machine learning

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Leveraging randomized compiling for the QITE algorithm

arXiv

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arXiv 2021年

作者： Ville, Jean-Loup Morvan, Alexis Hashim, Akel Naik, Ravi K. Lu, Marie Mitchell, Bradley Kreikebaum, John-Mark O’Brien, Kevin P. Wallman, Joel J. Hincks, Ian Emerson, Joseph Smith, Ethan Younis, Ed Iancu, Costin Santiago, David I. Siddiqi, Irfan Quantum Nanoelectronics Laboratory Dept. of Physics University of California at Berkeley BerkeleyCA94720 United States Computational Research Division Lawrence Berkeley National Lab BerkeleyCA94720 United States Materials Sciences Division Lawrence Berkeley National Lab BerkeleyCA94720 United States Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology CambridgeMA02139 United States Inst. for Quantum Computing Dept. of Applied Mathematics University of Waterloo WaterlooONN2L 3G1 Canada Quantum Benchmark Inc. KitchenerONN2H 5G5 Canada

The success of the current generation of Noisy Intermediate-Scale quantum (NISQ) hardware shows that quantum hardware may be able to tackle complex problems even without error correction. One outstanding issue is that of coherent errors arising from the increased complexity of these devices. These errors can accumulate through a circuit, making their impact on algorithms hard to predict and mitigate. Iterative algorithms like quantum Imaginary Time Evolution are susceptible to these errors. This article presents the combination of both noise tailoring using Randomized Compiling and error mitigation with a purification. We also show that Cycle Benchmarking gives an estimate of the reliability of the purification. We apply this method to the quantum Imaginary Time Evolution of a Transverse Field Ising Model and report an energy estimation and a ground state infidelity both below 1%. Our methodology is general and can be used for other algorithms and platforms. We show how combining noise tailoring and error mitigation will push forward the performance of NISQ devices. © 2021, CC BY.

关键词： Benchmarking

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Revealing the ultra-sensitive calorimetric properties of superconducting magic-angle twisted bilayer graphene

arXiv

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arXiv 2021年

作者： Di Battista, G. Seifert, P. Watanabe, K. Taniguchi, T. Fong, K.C. Principi, A. Efetov, Dmitri K. ICFO - Institut de Ciencies Fotoniques The Barcelona Institute of Science and Technology Castelldefels Barcelona08860 Spain Research Center for Functional Materials National Institute for Materials Science 1-1 Namiki Tsukuba305-0044 Japan International Center for Materials Nanoarchitectonics National Institute for Materials Science 1-1 Namiki Tsukuba305-0044 Japan Quantum Engineering and Computing Group Raytheon BBN Technologies CambridgeMA02138 United States Department of Physics and Astronomy The University of Manchester ManchesterM13 9PL United Kingdom

The allegedly unconventional superconducting phase of magic-angle twisted bilayer graphene (MATBG)1 has been predicted to possess extraordinary thermal properties, as it is formed from a highly diluted electron ensemble with both a record-low carrier density n ~ 1011 cm-2 and electronic heat capacity Ce B. While these attributes position MATBG as a ground-breaking material platform for revolutionary calorimetric applications2, these properties have so far not been experimentally shown. Here we reveal the ultra-sensitive calorimetric properties of a superconducting MATBG device, by monitoring its temperature dependent critical current Ic under continuous laser heating with a wavelength of λ = 1550nm. From the bolometric effect, we are able to extract the temperature dependence of the electronic thermal conductance Gth, which remarkably has a non-zero value Gth = 0.19 pW/K at 35mK and in the low temperature limit is consistent with a power law dependence, as expected for nodal superconductors. Photo-voltage measurements on this non-optimized device reveal a peak responsivity of S = 5.8 x 107 V/W when the device is biased close to Ic, with a noise-equivalent power of NEP = 5.5 x 10-16 WHz-1/2. Analysis of the intrinsic performance shows that a theoretically achievable limit is defined by thermal fluctuations and can be as low as NEPTEF -20 WHz-1/2, with operation speeds as fast as τ ~ 500 ns. This establishes superconducting MATBG as a revolutionizing active material for ultra-sensitive photon-detection applications, which could enable currently unavailable technologies such as THz photon-number-resolving single-photon-detectors. © 2021, CC BY.

关键词： Photons

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Calibration of flux crosstalk in large-scale flux-tunable superconducting quantum circuits

arXiv

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arXiv 2021年

作者： Dai, Xi Tennant, D.M. Trappen, R. Martinez, A.J. Melanson, D. Yurtalan, M.A. Tang, Y. Novikov, S. Grover, J.A. Disseler, S.M. Basham, J.I. Das, R. Kim, D.K. Melville, A.J. Niedzielski, B.M. Weber, S.J. Yoder, J.L. Lidar, D.A. Lupascu, A. Institute for Quantum Computing Department of Physics and Astronomy University of Waterloo WaterlooONN2L 3G1 Canada Department of Electrical and Computer Engineering University of Waterloo WaterlooONN2L 3G1 Canada Northrop Grumman Corporation LinthicumMD21090 United States MIT Lincoln Laboratory 244 Wood Street LexingtonMA02421 United States Departments of Electrical & Computer Engineering Chemistry and Physics Center for Quantum Information Science & Technology University of Southern California Los AngelesCA90089 United States Waterloo Institute for Nanotechnology University of Waterloo WaterlooONN2L 3G1 Canada

Magnetic flux tunability is an essential feature in most approaches to quantum computing based on superconducting qubits. Independent control of the fluxes in multiple loops is hampered by crosstalk. Calibrating flux crosstalk becomes a challenging task when the circuit elements interact strongly. We present a novel approach to flux crosstalk calibration, which is circuit model independent and relies on an iterative process to gradually improve calibration accuracy. This method allows us to reduce errors due to the inductive coupling between loops. The calibration procedure is automated and implemented on devices consisting of tunable flux qubits and couplers with up to 27 control loops. We devise a method to characterize the calibration error, which is used to show that the errors of the measured crosstalk coefficients are all below 0.17%. Copyright © 2021, The Authors. All rights reserved.

关键词： Crosstalk

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Demonstration of long-range correlations via susceptibility measurements in a one-dimensional superconducting Josephson spin chain

arXiv

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arXiv 2021年

作者： Tennant, Daniel M. Dai, Xi Martinez, Antonio J. Trappen, Robbyn Melanson, Denis Yurtalan, M.A. Tang, Yongchao Bedkihal, Salil Yang, Rui Novikov, Sergei Grover, Jeffery A. Disseler, Steven M. Basham, James I. Das, Rabindra Kim, David K. Melville, Alexander J. Niedzielski, Bethany M. Weber, Steven J. Yoder, Jonilyn L. Kerman, Andrew J. Mozgunov, Evgeny Lidar, Daniel A. Lupascu, Adrian Institute for Quantum Computing University of Waterloo WaterlooONN2L 3G1 Canada Department of Physics and Astronomy University of Waterloo WaterlooONN2L 3G1 Canada Northrop Grumman Corporation LinthicumMD21090 United States MIT Lincoln Laboratory LexingtonMA02421 United States Center for Quantum Information Science & Technology University of Southern California Los AngelesCA90089 United States Departments of Electrical & Computer Engineering Chemistry and Physics Waterloo Institute for Nanotechnology University of Waterloo WaterlooONN2L 3G1 Canada

Spin chains have long been considered an effective medium for long-range interactions, entanglement generation, and quantum state transfer. In this work, we explore the properties of a spin chain implemented with superconducting flux circuits, designed to act as a connectivity medium between two superconducting qubits. The susceptibility of the chain is probed and shown to support long-range, cross chain correlations. In addition, interactions between the two end qubits, mediated by the coupler chain, are demonstrated. This work has direct applicability in near term quantum annealing processors as a means of generating long-range, coherent coupling between qubits. © 2021, CC BY.

关键词： Spin dynamics

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Suppressing decoherence in quantum plasmonic systems by the spectral-hole-burning effect

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Physical Review A 2021年第5期103卷 053517-053517页

作者： Jia-Bin You Xiao Xiong Ping Bai Zhang-Kai Zhou Wan-Li Yang Ching Eng Png Leong Chuan Kwek Lin Wu Institute of High Performance Computing A*STAR (Agency for Science Technology and Research) 1 Fusionopolis Way No. 16-16 Connexis Singapore 138632 State Key Laboratory of Optoelectronic Materials and Technologies School of Physics Sun Yat-sen University Guangzhou 510275 China State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics Wuhan Institute of Physics and Mathematics Chinese Academy of Sciences Wuhan 430071 China Centre for Quantum Technologies National University of Singapore 3 Science Drive 2 Singapore 117543 MajuLab CNRS-UNS-NUS-NTU International Joint Research Unit UMI 3654 Singapore National Institute of Education and Institute of Advanced Studies Nanyang Technological University 1 Nanyang Walk Singapore 637616 School of Electrical and Electronic Engineering Block S2.1 50 Nanyang Avenue Singapore 639798

quantum plasmonic systems suffer from significant decoherence due to the intrinsically large dissipative and radiative dampings. Based on our quantum simulations via a quantum tensor network algorithm, we numerically demonstrate the mitigation of this restrictive drawback by hybridizing a plasmonic nanocavity with an emitter ensemble with inhomogeneously broadened transition frequencies. By burning two narrow spectral holes in the spectral density of the emitter ensemble, the coherent time of Rabi oscillation for the hybrid system is increased tenfold. With the suppressed decoherence, we move one step further in bringing plasmonic systems into practical quantum applications.

关键词： Cavity quantum electrodynamics Plasmonics quantum optics

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