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Uncover Topology by quantum Quench Dynamics

Physical Review Letters 2018年第25期121卷 250403-250403页

作者： Wei Sun Chang-Rui Yi Bao-Zong Wang Wei-Wei Zhang Barry C. Sanders Xiao-Tian Xu Zong-Yao Wang Joerg Schmiedmayer Youjin Deng Xiong-Jun Liu Shuai Chen Jian-Wei Pan Shanghai Branch National Laboratory for Physical Sciences at Microscale and Department of Modern Physics University of Science and Technology of China Shanghai 201315 China Chinese Academy of Sciences Center for Excellence: Quantum Information and Quantum Physics University of Science and Technology of China Hefei Anhui 230326 China CAS-Alibaba Lab for Quantum Computation Shanghai 201315 China International Center for Quantum Materials School of Physics Peking University Beijing 100871 China Collaborative Innovation Center of Quantum Matter Beijing 100871 China Centre for Engineered Quantum Systems School of Physics The University of Sydney Sydney New South Wales 2006 Australia Institute for Quantum Science and Technology University of Calgary Calgary Alberta T2N 1N4 Canada Program in Quantum Information Science Canadian Institute for Advanced Research Toronto Ontario M5G 1Z8 Canada Vienna Center for Quantum Science and Technology Atominstitut TU Wien Stadionallee 2 1020 Vienna Austria

Topological quantum states are characterized by nonlocal invariants. We present a new dynamical approach for ultracold-atom systems to uncover their band topology, and we provide solid evidence to demonstrate its experimental advantages. After quenching a two-dimensional (2D) Chern band, realized in an ultracold Rb87 gas from a trivial to a topological parameter regime, we observe an emerging ring structure in the spin dynamics during the unitary evolution, which uniquely corresponds to the Chern number for the postquench band. By extracting 2D bulk topology from the 1D ring pattern, our scheme displays simplicity and is insensitive to perturbations. This insensitivity enables a high-precision determination of the full phase diagram for the system’s band topology.

关键词： Spin-orbit coupling Synthetic gauge fields Bose gases

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Higher winding number in a nonunitary photonic quantum walk

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Physical Review A 2018年第6期98卷 063847-063847页

作者： Lei Xiao Xingze Qiu Kunkun Wang Zhihao Bian Xiang Zhan Hideaki Obuse Barry C. Sanders Wei Yi Peng Xue Beijing Computational Science Research Center Beijing 100084 China Department of Physics Southeast University Nanjing 211189 China Key Laboratory of Quantum Information University of Science and Technology of China CAS Hefei 230026 China Synergetic Innovation Center in Quantum Information and Quantum Physics University of Science and Technology of China CAS Hefei 230026 China Department of Applied Physics Hokkaido University Sapporo 060-8628 Japan Hefei National Laboratory for Physical Sciences at Microscale University of Science and Technology of China CAS Hefei 230026 China Institute for Quantum Science and Technology University of Calgary Alberta Canada T2N 1N4 Program in Quantum Information Science Canadian Institute for Advanced Research Toronto Ontario Canada M5G 1M1 State Key Laboratory of Precision Spectroscopy East China Normal University Shanghai 200062 China

Topological matter exhibits exotic properties yet phases characterized by large topological invariants are difficult to implement, despite rapid experimental progress. A promising route toward higher topological invariants is via engineered Floquet systems, particularly in photonics, where flexible control holds the potential of extending the study of conventional topological matter to novel regimes. Here we implement a one-dimensional photonic quantum walk to explore large winding numbers. By introducing partial measurements and hence loss into the system, we detect winding numbers of three and four in multistep nonunitary quantum walks, which agree well with theoretical predictions. Moreover, by probing statistical moments of the walker, we identify locations of topological phase transitions in the system and reveal the breaking of pseudounitary near topological phase boundaries. As the winding numbers are associated with nonunitary time evolution, our investigation enriches understanding of topological phenomena in nonunitary settings.

关键词： Geometric & topological phases Open quantum systems & decoherence Optical quantum information processing quantum optics quantum simulation Random walks

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JASMINE: Near-Infrared Astrometry and Time Series Photometry science

arXiv

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arXiv 2023年

作者： Kawata, Daisuke Kawahara, Hajime Gouda, Naoteru Secrest, Nathan J. Kano, Ryouhei Kataza, Hirokazu Isobe, Naoki Ohsawa, Ryou Usui, Fumihiko Yamada, Yoshiyuki Graham, Alister W. Pettitt, Alex R. Asada, Hideki Baba, Junichi Bekki, Kenji Dorland, Bryan N. Fujii, Michiko Fukui, Akihiko Hattori, Kohei Hirano, Teruyuki Kamizuka, Takafumi Kashima, Shingo Kawanaka, Norita Kawashima, Yui Klioner, Sergei A. Kodama, Takanori Koshimoto, Naoki Kotani, Takayuki Kuzuhara, Masayuki Levine, Stephen E. Majewski, Steven R. Masuda, Kento Matsunaga, Noriyuki Miyakawa, Kohei Miyoshi, Makoko Morihana, Kumiko Nishi, Ryoichi Notsu, Yuta Omiya, Masashi Sanders, Jason Tanikawa, Ataru Tsujimoto, Masahiro Yano, Taihei Aizawa, Masataka Arimatsu, Ko Biermann, Michael Boehm, Celine Chiba, Masashi Debattista, Victor P. Gerhard, Ortwin Hirabayashi, Masayuki Hobbs, David Ikenoue, Bungo Izumiura, Hideyuki Jordi, Carme Kohara, Naoki Löffler, Wolfgang Luri, Xavier Mase, Ichiro Miglio, Andrea Mitsuda, Kazuhisa Newswander, Trent Nishiyama, Shogo Obuchi, Yoshiyuki Ootsubo, Takafumi Ouchi, Masami Ozaki, Masanobu Perryman, Michael Prusti, Timo Ramos, Pau Read, Justin I. Rich, R. Michael Schönrich, Ralph Shikauchi, Minori Shimizu, Risa Suematsu, Yoshinori Tada, Shotaro Takahashi, Aoi Tatekawa, Takayuki Tatsumi, Daisuke Tsujimoto, Takuji Tsuzuki, Toshihiro Urakawa, Seitaro Uraguchi, Fumihiro Utsunomiya, Shin Van Eylen, Vincent van Leeuwen, Floor Wada, Takehiko Walton, Nicholas A. National Astronomical Observatory of Japan 2-21-1 Osawa Mitaka Tokyo181-8588 Japan Mullard Space Science Laboratory University College London Holmbury St. Mary Dorking SurreyRH5 6NT United Kingdom Institute of Space and Astronautical Science Japan Aerospace Exploration Agency 3-1-1 Yoshinodai Chuo-ku Kanagawa Sagamihara252-5210 Japan Astronomical Science Program Graduate Institute for Advanced Studies SOKENDAI 2-21-1 Osawa Mitaka Tokyo181-1855 Japan U.S. Naval Observatory 3450 Massachusetts Ave NW WashingtonDC20392-5420 United States Department of Physics Kyoto University Kitashirakawa-oiwake-cho Sakyo-ku Kyoto606-8502 Japan Centre for Astrophysics and Supercomputing Swinburne University of Technology HawthornVIC3122 Australia Department of Physics and Astronomy California State University Sacramento 6000 J Street SacramentoCA95819-6041 United States Graduate School of Science and Technology Hirosaki University Aomori036-8561 Japan Graduate School of Science and Engineering Kagoshima University 1-21-35 Korimoto Kagoshima890-0065 Japan International Centre for Radio Astronomy Research The University of Western Australia 7 Fairway CrawleyWA6009 Australia Department of Astronomy Graduate School of Science The University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo113-0033 Japan Department of Earth and Planetary Science Graduate School of Science The University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo113-0033 Japan Institute of Statistical Mathematics 10-3 Midoricho Tachikawa Tokyo190-8562 Japan Astrobiology Center 2-21-1 Osawa Mitaka Tokyo181-8588 Japan Institute of Astronomy Graduate School of Science The University of Tokyo 2-21-1 Osawa Mitaka Tokyo181-0015 Japan Center for Gravitational Physics and Quantum Information Yukawa Institute for Theoretical Physics Kyoto University Kitashirakawa-oiwake-cho Sakyo-ku Kyoto606-8502 Japan Cluster for Pioneering Research RIKEN 2-1 Hirosawa Saitama Wako351-0198 Japan Lohrmann Observ

Japan Astrometry Satellite Mission for INfrared Exploration (JASMINE) is a planned M-class science space mission by the Institute of Space and Astronautical science, the Japan Aerospace Exploration Agency. JASMINE has two main science goals. One is the Galactic archaeology with Galactic Center Survey, which aims to reveal the Milky Way's central core structure and formation history from Gaia-level (∼25 µas) astrometry in the Near-Infrared (NIR) Hw-band (1.0-1.6 µm). The other is the Exoplanet Survey, which aims to discover transiting Earth-like exoplanets in the habitable zone from NIR time-series photometry of M dwarfs when the Galactic center is not accessible. We introduce the mission, review many science objectives, and present the instrument concept. JASMINE will be the first dedicated NIR astrometry space mission and provide precise astrometric information of the stars in the Galactic center, taking advantage of the significantly lower extinction in the NIR. The precise astrometry is obtained by taking many short-exposure images. Hence, the JASMINE Galactic center survey data will be valuable for studies of exoplanet transits, asteroseismology, variable stars and microlensing studies, including discovery of (intermediate mass) black holes. We highlight a swath of such potential science, and also describe synergies with other missions. © 2023, CC BY.

关键词： Time series

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Computational advantage from quantum superposition of multiple temporal orders of photonic gates

arXiv

引用

arXiv 2020年

作者： Taddei, Márcio M. Cariñe, Jaime Martínez, Daniel García, Tania Guerrero, Nayda Abbott, Alastair A. Araújo, Mateus Branciard, Cyril Gómez, Esteban S. Walborn, Stephen P. Aolita, Leandro Lima, Gustavo Instituto de Física Federal University of Rio de Janeiro P. O. Box 68528 Rio de Janeiro21941-972 Brazil ICFO - Institut de Ciencies Fotòniques The Barcelona Institute of Science and Technology Castelldefels Barcelona08860 Spain Departamento de Física Universidad de Concepción Concepción160-C Chile ANID Millennium Science Initiative Program Millennium Institute for Research in Optics Universidad de Concepción Concepción160-C Chile Departamento de Ingeniería Eléctrica Universidad Católica de la Santísima Concepción Alonso de Ribera 2850 Concepción Chile Department of Applied Physics University of Geneva Geneva1211 Switzerland Univ. Grenoble Alpes Inria Grenoble38000 France Austrian Academy of Sciences Boltzmanngasse 3 Vienna1090 Austria Univ. Grenoble Alpes CNRS Grenoble INP Institut Néel Grenoble38000 France Quantum Research Centre Technology Innovation Institute Abu Dhabi United Arab Emirates

Models for quantum computation with circuit connections subject to the quantum superposition principle have been recently proposed. There, a control quantum system can coherently determine the order in which a target quantum system undergoes N gate operations. This process, known as the quantum N-switch, is a resource for several information-processing tasks. In particular, it provides a computational advantage - over fixed-gate-order quantum circuits - for phase-estimation problems involving N unknown unitary gates. However, the corresponding algorithm requires an experimentally unfeasible target-system dimension (super-)exponential in N. Here, we introduce a promise problem for which the quantum N-switch gives an equivalent computational speed-up with target-system dimension as small as 2 regardless of N. We use state-of-the-art multi-core optical-fiber technology to experimentally demonstrate the quantum N-switch with N=4 gates acting on a photonic-polarization qubit. This is the first observation of a quantum superposition of more than N=2 temporal orders, demonstrating its usefulness for efficient phase-estimation. Copyright © 2020, The Authors. All rights reserved.

关键词： quantum optics

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Uncover topology by quantum quench dynamics

arXiv

引用

arXiv 2018年

作者： Sun, Wei Yi, Chang-Rui Wang, Bao-Zong Zhang, Wei-Wei Sanders, Barry C. Xu, Xiao-Tian Wang, Zong-Yao Schmiedmayer, Joerg Deng, Youjin Liu, Xiong-Jun Chen, Shuai Pan, Jian-Wei Shanghai Branch National Laboratory for Physical Sciences Microscale Department of Modern Physics University of Science and Technology of China Shanghai201315 China Chinese Academy of Sciences Center for Exellence: Quantum Information and Quantum Physics University of Science and Technology of China Hefei Anhui230326 China CAS-Alibaba Lab for quantum computation Shanghai201315 China International Center for Quantum Materials School of Physics Peking University Beijing100871 China Collaborative Innovation Center of Quantum Matter Beijing100871 China Centre for Engineered Quantum Systems School of Physics University of Sydney SydneyNSW2006 Australia Institute for Quantum Science and Technology University of Calgary CalgaryABT2N1N4 Canada Program in Quantum Information Science Canadian Institute for Advanced Research TorontoONM5G1Z8 Canada Vienna Center for Quantum Science and Technology Atominstitut TU Wien Stadionallee 2 Vienna1020 Austria

Topological quantum states are characterized by nonlocal invariants, and their detection is intrinsically challenging. Various strategies have been developed to study topological Hamiltonians through their equilibrium states. We present a fundamentally new, high-precision dynamical approach, revealing topology through the unitary evolution after a quench from a topological trivial initial state with a two-dimensional Chern band realized in an ultracold 87Rb atom gas. The emerging ring structure in the spin dynamics uniquely determines the Chern number for the post-quench band and enables probing the full phase diagram of the band topology with high precision. Besides, we also measure the topological band gap and the domain wall structure dynamically formed in the momentum space during the long-term evolution. Our dynamical approach provides a way towards observing a universal bulk-ring correspondence, and has broad applications in exploring topological quantum matter. Copyright © 2018, The Authors. All rights reserved.

关键词： Topology

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Experimental quantum switching for exponentially superior quantum communication complexity

arXiv

引用

arXiv 2018年

作者： Wei, Kejin Tischler, Nora Zhao, Si-Ran Li, Yu-Huai Arrazola, Juan Miguel Liu, Yang Zhang, Weijun Li, Hao You, Lixing Wang, Zhen Chen, Yu-Ao Sanders, Barry C. Zhang, Qiang Pryde, Geoff J. Xu, Feihu Pan, Jian-Wei Shanghai Branch Hefei National Laboratory for Physical Sciences at Microscale Department of Modern Physics University of Science and Technology of China Shanghai201315 China CAS Center for Excellence Synergetic Innovation Center in Quantum Information and Quantum Physics University of Science and Technology of China Shanghai201315 China Centre for Quantum Dynamics Griffith University BrisbaneQLD4111 Australia Xanadu 372 Richmond Street W TorontoONM5V 1X6 Canada Centre for Quantum Technologies National University of Singapore 3 Science Drive 2 Singapore117543 Singapore CAS Center for Excellence Synergetic Innovation Center in Quantum Information and Quantum Physics University of Science and Technology of China Shanghai201315 China State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences Shanghai200050 China Institute for Quantum Science and Technology University of Calgary ABT2N 1N4 Canada Program in Quantum Information Science Canadian Institute for Advanced Research TorontoONM5G 1M1 Canada

Finding exponential separation between quantum and classical information tasks is like striking gold in quantum information research. Such an advantage is believed to hold for quantum computing but is proven for quantum communication complexity. Recently, a novel quantum resource called the quantum switch—which creates a coherent superposition of the causal order of events, known as quantum causality—has been harnessed theoretically in a new protocol providing provable exponential separation. We experimentally demonstrate such an advantage by realizing a superposition of communication directions for a two-party distributed computation. Our photonic demonstration employs d-dimensional quantum systems, qudits, up to d = 213 dimensions and demonstrates a communication complexity advantage, requiring less than (0.696±0.006) times the communication of any causally ordered protocol. These results elucidate the crucial role of the coherence of communication direction in achieving the exponential separation for the one-way processing task, and open a new path for experimentally exploring the fundamentals and applications of advanced features of indefinite causal structures. Copyright © 2018, The Authors. All rights reserved.

关键词： Separation

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Exposure of subtle multipartite quantum nonlocality

arXiv

引用

arXiv 2019年

作者： Taddei, M.M. Silva, T.L. Nery, R.V. Aguilar, G.H. Walborn, S.P. Aolita, L. Federal University of Rio de Janeiro Caixa Postal 68528 Rio de Janeiro RJ21941-972 Brazil ICFO - Institut de Ciencies Fotòniques Barcelona Institute of Science and Technology Castelldefels Barcelona08860 Spain International Institute of Physics Federal University of Rio Grande do Norte Natal59070-405 Brazil Departamento de Física Universidad de Concepción Concepción160-C Chile ANID – Millennium Science Initiative Program – Millennium Institute for Research in Optics Universidad de Concepción Concepción160-C Chile Quantum Research Centre Technology Innovation Institute Abu Dhabi United Arab Emirates

The celebrated Einstein-Podolsky-Rosen quantum steering has a complex structure in the multipartite scenario. We show that a naively defined criterion for multipartite steering allows, like in Bell nonlocality, for a contradictory effect whereby local operations could create steering seemingly from scratch. Nevertheless, neither in steering nor in Bell nonlocality has this effect been experimentally confirmed. Operational consistency is reestablished by presenting a suitable redefinition: there is a subtle form of steering already present at the start, and it is only exposed — as opposed to created — by the local operations. We devise protocols that, remarkably, are able to reveal, in seemingly unsteerable systems, not only steering, but also Bell nonlocality. Moreover, we find concrete cases where entanglement certification does not coincide with steering. A causal analysis reveals the crux of the issue to lie in hidden signaling. Finally, we implement one of the protocols with three photonic qubits deterministically, providing the experimental demonstration of both exposure and super-exposure of quantum nonlocality. Copyright © 2019, The Authors. All rights reserved.

关键词： Bells

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Higher winding number in a non-unitary photonic quantum walk

arXiv

引用

arXiv 2018年

作者： Xiao, Lei Qiu, Xingze Wang, Kunkun Bian, Zhihao Zhan, Xiang Obuse, Hideaki Sanders, Barry C. Yi, Wei Xue, Peng Beijing Computational Science Research Center Beijing100084 China Department of Physics Southeast University Nanjing211189 China Key Laboratory of Quantum Information University of Science and Technology of China CAS Hefei230026 China Synergetic Innovation Center in Quantum Information and Quantum Physics University of Science and Technology of China CAS Hefei230026 China Department of Applied Physics Hokkaido University Sapporo060-8628 Japan Hefei National Laboratory for Physical Sciences at Microscale University of Science and Technology of China CAS Hefei230026 China Institute for Quantum Science and Technology University of Calgary ABT2N 1N4 Canada Program in Quantum Information Science Canadian Institute for Advanced Research TorontoONM5G 1M1 Canada State Key Laboratory of Precision Spectroscopy East China Normal University Shanghai200062 China

Topological matter exhibits exotic properties yet phases characterized by large topological invariants are difficult to implement, despite rapid experimental progress. A promising route toward higher topological invariants is via engineered Floquet systems, particularly in photonics, where flexible control holds the potential of extending the study of conventional topological matter to novel regimes. Here we implement a one-dimensional photonic quantum walk to explore large winding numbers. By introducing partial measurements and hence loss into the system, we detect winding numbers of three and four in multi-step non-unitary quantum walks, which agree well with theoretical predictions. Moreover, by probing statistical moments of the walker, we identify locations of topological phase transitions in the system, and reveal the breaking of pseudo-unitary near topological phase boundaries. As the winding numbers are associated with non-unitary time evolution, our investigation enriches understanding of topological phenomena in non-unitary settings. Copyright © 2018, The Authors. All rights reserved.

关键词： Winding

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Quasi-fine-grained uncertainty relations

arXiv

引用

arXiv 2018年

作者： Xiao, Yunlong Xiang, Yu He, Qiongyi Sanders, Barry C. Department of Mathematics and Statistics University of Calgary CalgaryABT2N 1N4 Canada Institute for Quantum Science and Technology University of Calgary CalgaryABT2N 1N4 Canada State Key Laboratory of Mesoscopic Physics School of Physics Peking University Collaborative Innovation Center of Quantum Matter Beijing100871 China Collaborative Innovation Center of Extreme Optics Shanxi University Taiyuan030006 China Program in Quantum Information Science Canadian Institute for Advanced Research TorontoONM5G 1M1 Canada

The uncertainty principle, a jewel at the heart of quantum theory, has been expressed by completely different forms, such as universal uncertainty relations, an uncertainty principle in the presence of quantum memory and a fine-grained uncertainty relation. We unify these uncertainty relations based on a special formalization of probability relations, namely introducing quasi-fine-grained uncertainty relations (QFGURs), which combine different measurements performed on spacelike-separated systems. Our generalized probability relations determine whether a quantum measurement exhibits typical quantum correlations and reveal a fundamental connection between basic elements of quantum theory, specifically, uncertainty measures, combined outcomes for different measurements, quantum memory, entanglement and Einstein-Podolsky-Rosen steering. Furthermore, we derive a universal form for entanglement and steering inequalities explicitly by applying our QFGURs. Copyright © 2018, The Authors. All rights reserved.

关键词： Uncertainty analysis

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Cooperative light scattering in any dimension

引用

Physical Review A 2017年第3期95卷 033832-033832页

作者： Tyler Hill Barry C. Sanders Hui Deng Physics Department University of Michigan Ann Arbor Michigan 48109 USA Institute for Quantum Science and Technology University of Calgary Alberta Canada T2N 1N4 Program in Quantum Information Science Canadian Institute for Advanced Research Toronto Ontario Canada M5G 1Z8 Hefei National Laboratory for Physical Sciences at the Microscale University of Science and Technology of China Hefei Anhui China Shanghai Branch CAS Center for Excellence and Synergetic Innovation Center in Quantum Information and Quantum Physics University of Science and Technology of China Shanghai China

We present a theory of cooperative light scattering valid in any dimension: connecting theories for an open line, open plane, and open space in the nonrelativistic regime. This theory includes near-field and dipole-orientation effects, highlighting how field-mode confinement controls the phenomena. We present an experimental implementation for planar collective effects.

关键词： Electromagnetism Open quantum systems & decoherence Superradiance & subradiance

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