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arXiv 2021年

作者： Noh, T. Xiao, Z. Cicak, K. Jin, X.Y. Doucet, E. Teufel, J. Aumentado, J. Govia, L.C.G. Ranzani, L. Kamal, A. Simmonds, R.W. Inc. of National Institute of Standards and Technology Boulder CO80305 United States Department of Physics and Applied Physics University of Massachusetts LowellMA01854 United States National Institute of Standards and Technology 325 Broadway St MS686.05 BoulderCO80305 United States Department of Physics University of Colorado BoulderCO80309 United States Quantum Engineering and Computing Raytheon Bbn Technologies CambridgeMA02138 United States

Cavity quantum electrodynamics (QED) with in-situ tunable interactions is important for developing novel systems for quantum simulation and computing.[1-6] The ability to tune the dispersive shifts of a cavity QED system provides more functionality for performing either quantum measurements or logical manipulations. Here, we couple two transmon qubits to a lumped-element cavity through a shared dc-SQUID.[7, 8] Our design balances the mutual capacitive and inductive circuit components so that both qubits are highly decoupled from the cavity[8], offering protection from decoherence processes[9, 10]. We show that by parametrically driving[7, 8, 11] the SQUID with an oscillating flux it is possible to independently tune the interactions between either of the qubits and the cavity dynamically. The strength and detuning of this cavity-QED interaction can be fully controlled through the choice of the parametric pump frequency and amplitude. As a practical demonstration, we perform pulsed parametric dispersive readout of both qubits while statically decoupled from the cavity. The dispersive frequency shifts of the cavity mode follow the expected magnitude and sign based on a simple theory that is supported by a more thorough theoretical investigation[12]. This parametric approach creates a new tunable cavity QED framework for developing quantum information systems with various future applications, such as entanglement and error correction via multi-qubit parity readout[13-15], state and entanglement stabilization[8, 16, 17], and parametric logical gates[18, 19]. © 2021, CC BY.

关键词： Electrodynamics

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Testing a quantum error-correcting code on various platforms

arXiv

引用

arXiv 2020年

作者： Guo, Qihao Zhao, Yuan-Yuan Grassl, Markus Nie, Xinfang Xiang, Guo-Yong Xin, Tao Yin, Zhang-Qi Zeng, Bei Institute for Quantum Computing Baidu Research Beijing100193 China Department of Applied Physics Xian Jiaotong University Xian Shaanxi710049 China Center for Quantum Computing Peng Cheng Laboratory Shenzhen518055 China CAS Key Laboratory of Quantum Information University of Science and Technology of China Hefei230026 China Max Planck Institute for the Science of Light Erlangen91058 Germany International Centre for Theory of Quantum Technologies Gdansk80-308 Poland Shenzhen Institute for Quantum Science and Engineering Southern University of Science and Technology Shenzhen518055 China Center for Quantum Technology Research School of Physics Beijing Institute of Technology Beijing100081 China Department of Physics Hong Kong University of Science and Technology Clear Water Bay Kowloon Hong Kong Department of Mathematics & Statistics University of Guelph GuelphONN1G 2W1 Canada Institute for Quantum Computing University of Waterloo WaterlooONN2L 3G1 Canada

quantum error correction plays an important role in fault-tolerant quantum information processing. It is usually difficult to experimentally realize quantum error correction, as it requires multiple qubits and quantum gates with high fidelity. Here we propose a simple quantum error-correcting code for the detected amplitude damping channel. The code requires only two qubits. We implement the encoding, the channel, and the recovery on an optical platform, the IBM Q System, and a nuclear magnetic resonance system. For all of these systems, the error correction advantage appears when the damping rate exceeds some threshold. We compare the features of these quantum information processing systems used and demonstrate the advantage of quantum error correction on current quantum computing platforms. Copyright © 2020, The Authors. All rights reserved.

关键词： Error correction

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Dynamical Kosterlitz-Thouless theory for two-dimensional ultracold atomic gases

arXiv

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arXiv 2020年

作者： Wu, Zhigang Zhang, Shizhong Zhai, Hui Guangdong Provincial Key Laboratory of Quantum Science and Engineering Shenzhen Institute for Quantum Science and Engineering Southern University of Science and Technology ShenzhenGuangdong518055 China Department of Physics HKU-UCAS Joint Institute for Theoretical Computational Physics at Hong Kong University of Hong Kong Hong Kong Institute for Advanced Study Tsinghua University Beijing100084 China Center for Quantum Computing Peng Cheng Laboratory Shenzhen518055 China

In this letter we develop a theory for the first and second sound in a two-dimensional atomic superfluid across the superfluid transition based on the dynamical Koterlitz-Thouless theory. We employ a set of modified two-fluid hydrodynamic equations which incorporate the dynamics of the quantised vortices, rather than the conventional ones for a three-dimensional superfluid. As far as the sound dispersion equation is concerned, the modification is essentially equivalent to replacing the static superfluid density with a frequency dependent one, renormalised by the frequency dependent "dielectric constant" of the vortices. This theory has two direct consequences. First, because the renormalised superfluid density at finite frequencies does not display discontinuity across the superfluid transition, in contrast to the static superfluid density, the sound velocities vary smoothly across the transition. Second, the theory includes dissipation due to free vortices, and thus naturally describes the sound-to-diffusion crossover for the second sound in the normal phase. With only one fitting parameter, our theory gives a perfect agreement with the experimental measurements of sound velocities across the transition, as well as the quality factor in the vicinity of the transition. The predictions from this theory can be further verified by future experiments. Copyright © 2020, The Authors. All rights reserved.

关键词： Acoustic wave velocity

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Optical gyroscope with coherent-boosted two-mode squeezed beams

Optical gyroscope with coherent-boosted two-mode squeezed be...

引用

2020 Frontiers in Optics Conference, FiO 2020

作者： Xiao, Xiao-Qi Matekole, Elisha S. Zhao, Jiankang Zeng, Guihua Dowling, Jonathan P. Lee, Hwang Department of Communication Engineering Shanghai Dianji University Shanghai200240 China Hearne Institute for Theoretical Physics Department of Physics and Astronomy Louisiana State University Baton RougeLA70803 United States State Key Laboratory of Advanced Optical Communication Systems and Networks Institute of Sensing and Navigation Department of Electronic Engineering Shanghai Jiaotong University Shanghai200030 China National Institute of Information and Communications Technology Tokyo184-8795 Japan NYU-ECNU Institute of Physics NYU Shanghai Shanghai200062 China CAS-Alibaba Quantum Computing Laboratory USTC Shanghai201315 China

ISBN: (纸本)9781943580804

We propose a new gyroscope scheme with a two-mode squeezed coherent light as the source. With the intensity-difference measurement, the phase sensitivity is better than the shot-noise limit, and can saturate the Crámer-Rao Bound. The loss inside the gyroscope can be compensated by adjusting the squeezing parameters. © OSA 2020 © 2020 The Author(s)

关键词： Shot noise

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Explore the Origin of Spontaneous Symmetry Breaking from Adaptive Perturbation Method

arXiv

引用

arXiv 2022年

作者： Ma, Chen-Te Pan, Yiwen Zhang, Hui Department of Physics and Astronomy Iowa State University AmesIA50011 United States Asia Pacific Center for Theoretical Physics Pohang University of Science and Technology Gyeongsangbuk-do Pohang37673 Korea Republic of Guangdong Provincial Key Laboratory of Nuclear Science Institute of Quantum Matter South China Normal University Guangdong Guangzhou510006 China School of Physics and Telecommunication Engineering South China Normal University Guangdong Guangzhou510006 China Guangdong-Hong Kong Joint Laboratory of Quantum Matter Southern Nuclear Science Computing Center South China Normal University Guangdong Guangzhou510006 China The Laboratory for Quantum Gravity and Strings Department of Mathematics and Applied Mathematics University of Cape Town Private Bag Rondebosch7700 South Africa School of Physics Sun Yat-Sen University Guangdong Guangzhou510275 China

Spontaneous symmetry breaking occurs when the underlying laws of a physical system are symmetric, but the vacuum state chosen by the system is not. The (3+1)d 4 theory is relatively simple compared to other more complex theories, making it a good starting point for investigating the origin of non-trivial vacua. The adaptive perturbation method is a technique used to handle strongly coupled systems. The study of strongly correlated systems is useful in testing holography. It has been successful in strongly coupled QM and is being generalized to scalar field theory to analyze the system in the strong-coupling regime. The unperturbed Hamiltonian does not commute with the usual number operator. However, the quantized scalar field admits a plane-wave expansion when acting on the vacuum. While quantizing the scalar field theory, the field can be expanded into plane-wave modes, making the calculations more tractable. However, the Lorentz symmetry, which describes how physical laws remain the same under certain spacetime transformations, might not be manifest in this approach. The proposed elegant resummation of Feynman diagrams aims to restore the Lorentz symmetry in the calculations. The results obtained using this method are compared with numerical solutions for specific values of the coupling constant λ = 1, 2, 4, 8, 16. Finally, we find evidence for quantum triviality, where self-consistency of the theory in the UV requires λ = 0. This result implies that the 4 theory alone does not experience SSB, and the = 0 phase is protected under the RG-flow by a boundary of Gaussian fixed-points. Copyright © 2022, The Authors. All rights reserved.

关键词： Numerical methods

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quantum Simulation for High-Energy Physics

引用

PRX quantum 2023年第2期4卷 027001-027001页

作者： Christian W. Bauer Zohreh Davoudi A. Baha Balantekin Tanmoy Bhattacharya Marcela Carena Wibe A. de Jong Patrick Draper Aida El-Khadra Nate Gemelke Masanori Hanada Dmitri Kharzeev Henry Lamm Ying-Ying Li Junyu Liu Mikhail Lukin Yannick Meurice Christopher Monroe Benjamin Nachman Guido Pagano John Preskill Enrico Rinaldi Alessandro Roggero David I. Santiago Martin J. Savage Irfan Siddiqi George Siopsis David Van Zanten Nathan Wiebe Yukari Yamauchi Kübra Yeter-Aydeniz Silvia Zorzetti Physics Division Lawrence Berkeley National Laboratory Berkeley California 94720 USA Department of Physics Maryland Center for Fundamental Physics and the NSF Institute for Robust Quantum Simulation University of Maryland College Park Maryland 20742 USA Department of Physics University of Wisconsin Madison Wisconsin 53706 USA T-2 Los Alamos National Laboratory Los Alamos New Mexico 87545 USA Fermi National Accelerator Laboratory Batavia Illinois 60510 USA Enrico Fermi Institute University of Chicago Chicago Illinois 60637 USA Kavli Institute for Cosmological Physics University of Chicago Chicago Illinois 60637 USA Department of Physics University of Chicago Chicago Illinois 60637 USA Department of Physics and Illinois Center for the Advanced Study of the Universe and Illinois Quantum Information Science and Technology Center University of Illinois Urbana Illinois 61801 USA QuEra Computing Inc Boston Massachusetts 02135 USA Department of Mathematics University of Surrey Guildford Surrey GU2 7XH United Kingdom Center for Nuclear Theory Department of Physics and Astronomy Stony Brook University New York 11794-3800 USA Department of Physics Brookhaven National Laboratory Upton New York 11973 USA Peng Huanwu Center for Fundamental Theory Hefei Anhui 230026 China Interdisciplinary Center for Theoretical Study University of Science and Technology of China Hefei Anhui 230026 China Pritzker School of Molecular Engineering Chicago Quantum Exchange and Kadanoff Center for Theoretical Physics University of Chicago Illinois 60637 USA qBraid Co. Harper Court 5235 Chicago Illinois 60615 USA Department of Physics Harvard University Cambridge Massachusetts 02138 USA Department of Physics and Astronomy University of Iowa Iowa City Iowa 52242 USA Duke Quantum Center Duke University Durham North Carolina 27701 USA Department of Electrical and Computer Engineering Duke University Durham North Carolina 27708 USA Department of Physics Duke University

It is for the first time that quantum simulation for high-energy physics (HEP) is studied in the U.S. decadal particle-physics community planning, and in fact until recently, this was not considered a mainstream topic in the community. This fact speaks of a remarkable rate of growth of this subfield over the past few years, stimulated by the impressive advancements in quantum information sciences (QIS) and associated technologies over the past decade, and the significant investment in this area by the government and private sectors in the U.S. and other countries. High-energy physicists have quickly identified problems of importance to our understanding of nature at the most fundamental level, from tiniest distances to cosmological extents, that are intractable with classical computers but may benefit from quantum advantage. They have initiated, and continue to carry out, a vigorous program in theory, algorithm, and hardware co-design for simulations of relevance to the HEP mission. This Roadmap is an attempt to bring this exciting and yet challenging area of research to the spotlight, and to elaborate on what the promises, requirements, challenges, and potential solutions are over the next decade and beyond.

关键词： quantum simulation

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Distributed quantum algorithm for Simon's problem

arXiv

引用

arXiv 2022年

作者： Tan, Jiawei Xiao, Ligang Qiu, Daowen Luo, Le Mateus, Paulo Institute of Quantum Computing and Computer Theory School of Computer Science and Engineering Sun Yat-Sen University Guangzhou510006 China The Guangdong Key Laboratory of Information Security Technology Sun Yat-Sen University 510006 China QUDOOR Technologies Inc. Guangzhou China School of Physics and Astronomy Sun Yat-Sen University Zhuhai519082 China Instituto de Telecomunicações Departamento de Matemática Instituto Superior Técnico Av. Rovisco Pais Lisbon1049-001 Portugal

Limited by today's physical devices, quantum circuits are usually noisy and difficult to be designed deeply. The novel computing architecture of distributed quantum computing is expected to reduce the noise and depth of quantum circuits. In this paper, we study the Simon's problem in distributed scenarios and design a distributed quantum algorithm to solve the problem. The algorithm proposed by us has the advantage of exponential acceleration compared with the classical distributed computing, and has the advantage of square acceleration compared with the best distributed quantum algorithm proposed before. In particular, the previous distributed quantum algorithm for Simon's problem can not be extended to the case of more than two computing nodes (i.e. two subproblems), but our distributed quantum algorithm can be extended to the case of multiple computing nodes (i.e. multiple subproblems) as well. Copyright © 2022, The Authors. All rights reserved.

关键词： Computer architecture

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Angle-Resolved Magneto-Chiral Anisotropy in a Non-Centrosymmetric Atomic Layer Superlattice

arXiv

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arXiv 2024年

作者： Cheng, Long Bao, Mingrui Zhang, Jingxian Zhang, Xue Yang, Qun Li, Qiang Cao, Hui Qiu, Dawei Liu, Jia Ye, Fei Wang, Qing Liang, Genhao Li, Hui Cheng, Guanglei Zhou, Hua Zuo, Jian-Min Zhou, Xiaodong Shen, Jian Zhu, Zhifeng Mu, Sai Wang, Wenbo Zhai, Xiaofang School of Physical Science and Technology ShanghaiTech University Pudong District Shanghai201210 China CAS Key Laboratory of Microscale Magnetic Resonance School of Physical Sciences University of Science and Technology of China Hefei230026 China School of Information Science and Technology ShanghaiTech University Pudong District Shanghai201210 China State Key Laboratory of Surface Physics Institute for Nanoelectronic Devices and Quantum Computing Fudan University Shanghai200433 China Materials Science Division Argonne National Laboratory LemontIL60439 United States Institutes of Physical Science and Information Technology Anhui University Hefei230601 China X-Ray Science Division Advanced Photon Source Argonne National Laboratory LemontIL60439 United States Department of Materials Science and Engineering Materials Research Laboratory University of Illinois Urbana–Champaign UrbanaIL61801 United States Center for Experimental Nanoscale Physics Department of Physics and Astronomy University of South Carolina ColumbiaSC29208 United States ShanghaiTech Laboratory for Topological Physics ShanghaiTech University Shanghai201210 China

Chirality in solid-state materials has sparked significant interest due to potential applications of topologically-protected chiral states in next-generation information technology. The electrical magneto-chiral effect (eMChE), arising from relativistic spin-orbit interactions, shows great promise for developing chiral materials and devices for electronic integration. Here we demonstrate an angle-resolved eMChE in an A-B-C-C type atomic-layer superlattice lacking time and space inversion symmetry. We observe non-superimposable enantiomers of left-handed and right-handed tilted uniaxial magnetic anisotropy as the sample rotates under static fields, with the tilting angle reaching a striking 45°. Magnetic force microscopy and atomistic simulations correlate the tilt to the emergence and evolution of chiral spin textures. The Dzyaloshinskii-Moriya interaction ‘lock’ effect in competition with Zeeman effect is demonstrated to be responsible for the angle-resolved eMChE. Our findings open up a new horizon for engineering angle-resolved magneto-chiral anisotropy, shedding light on the development of novel angle-resolved sensing or writing techniques in chiral spintronics. Copyright © 2024, The Authors. All rights reserved.

关键词： Magnetic anisotropy

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Erratum: “Simulation of chiral motion of excitation within the ground-state manifolds of neutral atoms” [APL quantum 1, 036109 (2024)]

APL Quantum

引用

APL quantum 2024年第3期1卷

作者： Hao-Yuan Tang Xiao-Xuan Li Jia-Bin You Xiao-Qiang Shao Center for Quantum Sciences and School of Physics Northeast Normal University Changchun 130024 China Sino-European Institute of Aviation Engineering Civil Aviation University of China Tianjin 300300 China Institute of High Performance Computing A*STAR (Agency for Science Technology and Research) 1 Fusionopolis Way Connexis Singapore 138632 Center for Advanced Optoelectronic Functional Materials Research and Key Laboratory for UV Light-Emitting Materials and Technology of Ministry of Education Northeast Normal University Changchun 130024 China

In the original version of this article initially published,1 there were still some typographical errors that should be corrected.

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Simulation of chiral motion of excitation within the ground-state manifolds of neutral atoms

APL Quantum

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APL quantum 2024年第3期1卷

Laser-induced gauge fields in neutral atoms serve as a means of mimicking the effects of a magnetic field, providing researchers with a platform to explore behaviors analogous to those observed in condensed matter systems under real magnetic fields. Here, we propose a method to generate chiral motion in atomic excitations within the neutral atomic ground-state manifolds. This is achieved through the application of polychromatic driving fields coupled to the ground–Rydberg transition, along with unconventional Rydberg pumping. The scheme offers the advantage of arbitrary adjustment of the effective magnetic flux by setting the relative phases between different external laser fields. In addition, the effective interaction strength between the atomic ground states can be maintained at 10 kHz, surpassing the capabilities of the previous approach utilizing Floquet modulation. Notably, the proposed method can be readily extended to implement a hexagonal neutral atom lattice, serving as the fundamental unit in realizing the Haldane model.

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