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Author Correction: Sub-femtonewton force sensing in solution by super-resolved photonic force microscopy

Nature Photonics 2024年 998页

作者： Xuchen Shan Dajing Wang Jinlong Shi Hongyan Zhu Xiaolan Zhong Baolei Liu Weichang Hao Fan Wang Lei Ding Qian Peter Su Shihui Wen Dayong Jin Lei Jiang Chaohao Chen Yang Wang Zhaocun Huang Lingqian Chang Shen S. J. Wang Peter John Reece Wei Ren Xunyu Lu Jie Lu Lingdong Sun School of Physics Beihang University Beijing People’s Republic of China Science and Technology Center for Quantum Biology National Institute of Extremely-Weak Magnetic Field Infrastructure Hangzhou People’s Republic of China School of Biomedical Engineering Faculty of Engineering and Information Technology University of Technology Sydney Sydney New South Wales Australia Centre for Atomaterials and Nanomanufacturing School of Science RMIT University Melbourne Victoria Australia Institute for Biomedical Materials and Devices (IBMD) School of Mathematical and Physical Sciences Faculty of Science University of Technology Sydney Sydney New South Wales Australia Eastern Institute for Advanced Study Eastern Institute of Technology Ningbo People’s Republic of China Key Laboratory of Bio-Inspired Materials and Interfaces Sciences Technical Institute of Physics and Chemistry Chinese Academy of Sciences Beijing People’s Republic of China Australian Research Council Centre of Excellence for Transformative Meta-Optical Systems Department of Electronic Materials Engineering Research School of Physics The Australian National University Canberra Australian Capital Territory Australia Key Laboratory of Biomechanics and Mechanobiology (Ministry of Education) Beijing Advanced Innovation Center for Biomedical Engineering School of Biological Science and Medical Engineering Beihang University Beijing People’s Republic of China Computing and Information Systems Department Melbourne School of Engineering University of Melbourne Melbourne Victoria Australia School of Physics The University of New South Wales Sydney New South Wales Australia School of Chemistry & Chemical Engineering Shaanxi Normal University Xi’an People’s Republic of China Particles and Catalysis Research Laboratory School of Chemical Engineering The University of New South Wales Sydney New South Wales Australia Australian Artificial Intelligence Institute Faculty of Engineering and IT University of Technology

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Spinfoam on Lefschetz thimble: Markov chain Monte-Carlo computation of Lorentzian spinfoam propagator

arXiv

引用

arXiv 2020年

作者： Han, Muxin Huang, Zichang Liu, Hongguang Qu, Dongxue Wan, Yidun Department of Physics Florida Atlantic University 777 Glades Road Boca RatonFL33431-0991 United States Institut für Quantengravitation Universität Erlangen-Nürnberg Staudtstr. 7/B2 Erlangen91058 Germany State Key Laboratory of Surface Physics Fudan University Shanghai200433 China Department of Physics Center for Field Theory and Particle Physics Institute for Nanoelectronic devices and Quantum computing Fudan University Shanghai200433 China State Key Laboratory of Surface Physics Fudan University Shanghai200433 China Department of Physics Center for Field Theory and Particle Physics Institute for Nanoelectronic devices and Quantum computing Fudan University Shanghai200433 China Department of Physics Institute for Quantum Science and Engineering Southern University of Science and Technology Shenzhen518055 China

We compute numerically the Lorentzian Engle-Pereira-Rovelli-Livine (EPRL) spinfoam propagator on a 4-simplex, by adapting the methods of Lefschetz thimble and Markov Chain Monte-Carlo to oscillatory spinfoam integrals. Our method can compute any spinfoam observables at relatively large spins. We obtain the numerical results of the propagators at different spins and demonstrate their consistency with the expected spinfoam semi-classical behavior in the large spin limit. Our results exhibit significant quantum corrections at smaller spins. Our method is reliable and thus can be employed to discover the semi-classical and quantum behaviors of the spinfoam model. Copyright © 2020, The Authors. All rights reserved.

关键词： Monte Carlo methods

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NMRCloudQ： a quantum cloud experience on a nuclear magnetic resonance quantum computer

引用

Science Bulletin 2018年第1期63卷 17-23页

作者： Tao Xin Shilin Huang Sirui Lu Keren Li Zhihuang Luo Zhangqi Yin Jun Li Dawei Lu Guilu Long Bei Zeng Department of Physics Tsinghua University Beijing 100084 China Center for Quantum Information Institute for Interdiscriplinary Information Sciences Tsinghua University Belting 100084 China Beijing Computational Science Research Center Beijing 100193 China Institute for Quantum Computing University of Waterloo waterloo N2L 3C1 Ontario Canada Department of Physics and Institute for Quantum Science and Engineering Southern University of Science and Technology Shenzhen 518055 China The Innovative Center of Quantum Matter Beijing 100084 China Department of Mathematics and Statistics University of Guelph Guelph N1C 2W1 Ontario Canada

Cloud-based quantum computing is anticipated to be the most useful and reachable form for public users to experience with the power of quantum. As initial attempts, IBM Q has launched influential cloud services on a superconducting quantum processor in 2016, but no other platforms has followed up yet. Here,we report our new cloud quantum computing service – NMRCloud Q(http://***/zh-hans/),where nuclear magnetic resonance, one of the pioneer platforms with mature techniques in experimental quantum computing, plays as the role of implementing computing tasks. Our service provides a comprehensive software environment preconfigured with a list of quantum information processing packages,and aims to be freely accessible to either amateurs that look forward to keeping pace with this quantum era or professionals that are interested in carrying out real quantum computing experiments in person. In our current version, four qubits are already usable with in average 99.10% single-qubit gate fidelity and 97.15% two-qubit fidelity via randomized benchmaking tests. Improved control precisions as well as a new seven-qubit processor are also in preparation and will be available later.

关键词： quantum cloud Nuclear magnetic resonance Gradient ascent pulse engineering Randomized benchmarking

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Axion Dark Matter Search with Near-KSVZ Sensitivity Using the TM020 Mode

arXiv

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arXiv 2025年

作者： Bae, Sungjae Jeong, Junu Kim, Younggeun Youn, SungWoo Kim, Jinsu van Loo, Arjan F. Nakamura, Yasunobu Oh, Seonjeong Seong, Taehyeon Uchaikin, Sergey Kim, Jihn E. Semertzidis, Yannis K. Dark Matter Axion Group Institute for Basic Science Daejeon34126 Korea Republic of Center for Axion and Precision Physics Research Institute for Basic Science Daejeon34051 Korea Republic of Department of Physics Korea Advanced Institute of Science and Technology Daejeon34141 Korea Republic of Oskar Klein Centre Department of Physics Stockholm University AlbaNova StockholmSE-10691 Sweden Johannes Gutenberg-Universität Mainz Mainz55122 Germany GSI Helmholtzzentrum für Schwerionenforschung GmbH Darmstadt64291 Germany RIKEN Center for Quantum Computing Saitama Wako351-0198 Japan Department of Applied Physics Graduate School of Engineering The University of Tokyo Bunkyo-ku Tokyo113-8656 Japan Department of Physics Seoul National University Seoul08826 Korea Republic of

Dark matter remains one of the most profound mysteries in modern physics, with axions, a hypothetical particle proposed to resolve the strong CP problem, standing as a compelling candidate. Among various experimental strategies, cavity haloscopes currently offer the most sensitive method to detect axions, though their searches have largely been confined to axion masses below 10 µeV. However, recent theoretical developments suggest that the axion mass lies beyond this range. Higher-order cavity modes have been explored as a methodological approach to expand the search range, albeit with limited success in achieving both high sensitivity and broad tunability. In this work, we present a sensitive search for axions with masses around 21 µeV, utilizing the TM020 mode of a cylindrical cavity, which incorporated an innovative tuning mechanism. Our results reached 1.7 times the KSVZ sensitivity over 100 MHz, representing a significant improvement in this mass range and contributing to the experimental search for axion dark matter at higher masses. Copyright © 2025, The Authors. All rights reserved.

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First-principles study of magnon-phonon interactions in gadolinium iron garnet

arXiv

引用

arXiv 2019年

作者： Wang, Lian-Wei Xie, Li-Shan Xu, Peng-Xiang Xia, Ke Center for Advanced Quantum Studies Department of Physics Beijing Normal University Beijing100875 China Shenzhen Institute for Quantum Science and Engineering Department of Physics Southern University of Science and Technology Shenzhen518055 China Center for Quantum Computing Peng Cheng Laboratory Shenzhen518005 China

We obtained the spin-wave spectrum based on a first-principles method of exchange constants, calculated the phonon spectrum by the first-principles phonon calculation method, and extracted the broadening of the magnon spectrum, ∆ω, induced by magnon-phonon interactions in gadolinium iron garnet (GdIG). Using the obtained exchange constants, we reproduce the experimental Curie temperature and the compensation temperature from spin models using Metropolis Monte Carlo (MC) simulations. In the lower-frequency regime, the fitted positions of the magnon-phonon dispersion crossing points are consistent with the inelastic neutron scattering experiment. We found that the ∆ω and magnon wave vector k have a similar relationship in YIG. The broadening of the acoustic spin-wave branch is proportional to k2, while that of the YIG-like acoustic branch and the optical branch are a constant. At a specific k, the magnon-phonon thermalization time of τmp are approximately 10−9 s, 10−13 s, and 10−14 s for acoustic branch, YIG-like acoustic branch, and optical branch, respectively. This research provides specific and effective information for developing a clear understanding of the spin-wave mediated spin Seebeck effect and complements the lack of lattice dynamics calculations of GdIG. Copyright © 2019, The Authors. All rights reserved.

关键词： Spin waves

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quantum algorithm for Petz recovery channels and pretty good measurements

arXiv

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arXiv 2020年

作者： Gilyén, András Lloyd, Seth Marvian, Iman Quek, Yihui Wilde, Mark M. Institute for Quantum Information and Matter California Institute of Technology PasadenaCA91125 United States Simons Institute for the Theory of Computing BerkeleyCA94720 United States Department of Mechanical Engineering Research Laboratory of Electronics Massachusetts Institute of Technology CambridgeMA02139 United States Department of Physics Department of Electrical and Computer Engineering Duke University DurhamNC27708 United States Information Systems Laboratory Stanford University StanfordCA94305 United States Hearne Institute for Theoretical Physics Department of Physics and Astronomy Center for Computation and Technology Louisiana State University Baton RougeLA70803 United States Stanford Institute for Theoretical Physics Stanford University StanfordCA94305 United States

The Petz recovery channel plays an important role in quantum information science as an operation that approximately reverses the effect of a quantum channel. The pretty good measurement is a special case of the Petz recovery channel, and it allows for near-optimal state discrimination. A hurdle to the experimental realization of these vaunted theoretical tools is the lack of a systematic and efficient method to implement them. This paper sets out to rectify this lack: using the recently developed tools of quantum singular value transformation and oblivious amplitude amplification, we provide a quantum algorithm to implement the Petz recovery channel when given the ability to perform the channel that one wishes to reverse. Moreover, we prove that, in some sense, our quantum algorithm’s usage of the channel implementation cannot be improved by more than a quadratic factor. Our quantum algorithm also provides a procedure to perform pretty good measurements when given multiple copies of the states that one is trying to distinguish. Copyright © 2020, The Authors. All rights reserved.

关键词： Recovery

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Discrimination of quantum states under locality constraints in the many-copy setting

arXiv

引用

arXiv 2020年

作者： Cheng, Hao-Chung Winter, Andreas Yu, Nengkun Department of Electrical Engineering Graduate Institute of Communication Engineering Department of Mathematics National Taiwan University Tapei106 Taiwan Center for Quantum Science and Engineering National Taiwan University Tapei106 Taiwan Physics Division National Center for Theoretical Sciences Taipei10617 Taiwan Quantum Computing Center New Taipei City236 Taiwan ICREA-Institució Catalana de Recerca i Estudis Avançats Barcelona08010 Spain Física Teòrica: Informaciò i Fenòmens Quàntics Departament de Física Universitat Autònoma de Barcelona Barcelona08193 Spain Computer Science Department Stony Brook University NY United States Centre for Quantum Software and Information Faculty of Engineering and Information Technology University of Technology Sydney UltimoNSW2007 Australia

We study quantum hypothesis testing between orthogonal states under restricted local measurements in the many-copy scenario. For testing arbitrary multipartite entangled pure state against its orthogonal complement state via the local operation and classical communication (LOCC) operation, we prove that the optimal average error probability always decays exponentially in the number of copies. Second, we provide a sufficient condition for the LOCC operations to achieve the same performance as the positive-partial-transpose (PPT) operations. We further show that testing a maximally entangled state against its orthogonal complement and testing extremal Werner states both fulfill the above-mentioned condition. Hence, we determine the explicit expressions for the optimal average error probability, the optimal trade-off between the type-I and type-II errors, and the associated Chernoff, Stein, Hoeffding, and strong converse exponents. Then, we show an infinite asymptotic separation between the separable (SEP) and PPT operations by providing a pair of states constructed from an unextendible product basis (UPB). The quantum states can be distinguished perfectly by PPT operations, while the optimal error probability, with SEP operations, admits an exponential lower bound. On the technical side, we prove this result by providing a quantitative version of the well-known statement that the tensor product of UPBs is a UPB. Copyright © 2020, The Authors. All rights reserved.

关键词： quantum entanglement

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Higher-order topological superconductivity: Possible realization in Fermi gases and Sr2RuO4

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Physical Review B 2019年第2期99卷 020508(R)-020508(R)页

作者： Zhigang Wu Zhongbo Yan Wen Huang Shenzhen Institute for Quantum Science and Engineering and Department of Physics Southern University of Science and Technology Shenzhen 518055 China School of Physics Sun Yat-sen University Guangzhou 510275 China Center for Quantum Computing Peng Cheng Laboratory Shenzhen 518005 China Institute for Advanced Study Tsinghua University Beijing 100084 China

We propose to realize second-order topological superconductivity in bilayer spin-polarized Fermi gas superfluids. We focus on systems with intralayer chiral p-wave pairing and with tunable interlayer hopping and interlayer interactions. Under appropriate circumstances, an interlayer even-parity s- or d-wave pairing may coexist with the intralayer p wave. Our model supports localized Majorana zero modes not only at the corners of the system geometry, but also at the termination of certain one-dimensional defects, such as superfluid domain walls and lattice line defects. We show how such topological phases and the Majorana zero modes therein can be manipulated in a multitude of ways by tuning the interlayer pairing and hopping. Generalized to spinful systems, we further propose that the putative p-wave superconductor Sr2RuO4, when subject to uniaxial strains, may also realize the desired topological phase.

关键词： Superconductivity Topological phase transition Topological phases of matter Topological superconductors

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Observing Geometry of quantum States in a Three-Level System

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Physical Review Letters 2020年第15期125卷 150401-150401页

作者： Jie Xie Aonan Zhang Ningping Cao Huichao Xu Kaimin Zheng Yiu-Tung Poon Nung-Sing Sze Ping Xu Bei Zeng Lijian Zhang National Laboratory of Solid State Microstructures Key Laboratory of Intelligent Optical Sensing and Manipulation (Ministry of Education) College of Engineering and Applied Sciences and School of Physics Nanjing University Nanjing 210093 China Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing 210093 China Department of Mathematics & Statistics University of Guelph Guelph N1G 2W1 Ontario Canada Institute for Quantum Computing University of Waterloo Waterloo N2L 3G1 Ontario Canada Department of Mathematics Iowa State University Ames Iowa 50011 USA Department of Applied Mathematics The Hong Kong Polytechnic University 999077 Hong Kong China Institute for Quantum Information & State Key Laboratory of High Performance Computing College of Computer National University of Defense Technology Changsha 410073 China Department of Physics The Hong Kong University of Science and Technology Clear Water Bay Kowloon 999077 Hong Kong China

In quantum mechanics, geometry has been demonstrated as a useful tool for inferring nonclassical behaviors and exotic properties of quantum systems. One standard approach to illustrate the geometry of quantum systems is to project the quantum state space onto the Euclidean space via measurements of observables on the system. Despite the great success of this method in studying two-level quantum systems (qubits) with the celebrated Bloch sphere representation, it is still difficult to reveal the geometry of multidimensional quantum systems. Here we report the first experiment measuring the geometry of such projections beyond the qubit. Specifically, we observe the joint numerical ranges of a triple of observables in a three-level photonic system, providing a complete classification of these ranges. We further show that the geometry of different classes reveals ground-state degeneracies of a Hamiltonian as a linear combination of the observables, which is related to quantum phases in the thermodynamic limit. Our results offer a versatile geometric approach for exploring the properties of higher-dimensional quantum systems.

关键词： Geometric & topological phases quantum foundations quantum measurements quantum phase transitions

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Breakdown of the Sharvin limit in spin pumping with interfacial Rashba spin-orbit coupling

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Physical Review B 2019年第4期99卷 045421-045421页

作者： Ka Shen Lei Wang Ke Xia Center for Advanced Quantum Studies and Department of Physics Beijing Normal University Beijing 100875 China Center for Spintronics and Quantum Systems State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University No. 28 Xianning West Road Xi'an Shaanxi 710049 China Shenzhen Institute for Quantum Science and Engineering and Department of Physics Southern University of Science and Technology Shenzhen 518055 China Center for Quantum Computing Peng Cheng Laboratory Shenzhen 518005 China

We theoretically investigate the role of the interfacial Rashba spin-orbit coupling in spin pumping based on a nonperturbative calculation. A nonmonotonic behavior is predicted in the Rashba-strength dependence of the Gilbert damping coefficients. We show that the in-plane damping component can exceed the Sharvin limit thanks to the Rashba-field-induced torque. Nevertheless, the pumped spin current remains below the Sharvin limit and satisfies the Onsager reciprocity relations with the spin-current-induced spin-transfer torque.

关键词： Spin pumping Spin torque Spin-orbit coupling

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