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Cooperative light scattering in any dimension

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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Detecting Topological Invariants in Nonunitary Discrete-Time quantum Walks

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Physical Review Letters 2017年第13期119卷 130501-130501页

作者： Xiang Zhan Lei Xiao Zhihao Bian Kunkun Wang Xingze Qiu Barry C. Sanders Wei Yi Peng Xue 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 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 T2N 1N4 Canada Program in Quantum Information Science Canadian Institute for Advanced Research Toronto Ontario M5G 1M1 Canada State Key Laboratory of Precision Spectroscopy East China Normal University Shanghai 200062 China

We report the experimental detection of bulk topological invariants in nonunitary discrete-time quantum walks with single photons. The nonunitarity of the quantum dynamics is enforced by periodically performing partial measurements on the polarization of the walker photon, which effectively introduces loss to the dynamics. The topological invariant of the nonunitary quantum walk is manifested in the quantized average displacement of the walker, which is probed by monitoring the photon loss. We confirm the topological properties of the system by observing localized edge states at the boundary of regions with different topological invariants. We further demonstrate the robustness of both the topological properties and the measurement scheme of the topological invariants against disorder.

关键词： Photon pairs & parametric down-conversion quantum simulation Random walks Topology

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High-field phase diagram and phase transitions in hexagonal manganite ErMnO3

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Physical Review B 2018年第21期97卷 214419-214419页

作者： Y. J. Liu J. F. Wang X. F. Sun J.-S. Zhou Z. C. Xia Z. W. Ouyang M. Yang C. B. Liu R. Chen J.-G. Cheng Y. Kohama M. Tokunaga K. Kindo Wuhan National High Magnetic Field Center and School of Physics Huazhong University of Science and Technology Wuhan 430074 China Department of Physics Hefei National Laboratory for Physical Sciences at Microscale and Key Laboratory of Strongly-Coupled Quantum Matter Physics (CAS) University of Science and Technology of China Hefei Anhui 230026 China Institute of Physical Science and Information Technology Anhui University Hefei Anhui 230601 China Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing Jiangsu 210093 China Materials Science and Engineering Program University of Texas at Austin Austin Texas 78712 USA Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of Sciences Beijing 100190 China The Institute for Solid State Physics (ISSP) University of Tokyo Chiba 277-8581 Japan

We report high-field magnetization study on the complex spin system h−ErMnO3 and propose an explanation for the c-axis phase transitions observed at 0.8, 12, and 28 T based on an analysis of the magnetization jumps, the complete H−T phase diagram and the irreducible representations of the Er3+ (2a and 4b) spin structure. Our measurements reveal that magnetic reorientation of the representation Γ2 induces the magnetic transition at 12 T, i.e., from a one-third plateau phase to a fully polarized phase. The magnetic transition at 0.8 T and the anomaly at 28 T can be understood by magnetic reorientations of Γ1→Γ2 and a reflection of the Mn3+ moments triggered by the Er3+ spins in strong magnetic fields. These scenarios are in good agreement with the magnetization process perpendicular to the c axis and the magnetic susceptibility results. These findings are helpful for a complete understanding of the magnetic phase transitions and the underlying physics in this family compounds.

关键词： Frustrated magnetism Magnetic phase transitions Magnetic systems Multiferroics Magnetization measurements

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Unity-Efficiency Parametric Down-Conversion via Amplitude Amplification

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Physical Review Letters 2017年第12期118卷 123601-123601页

作者： Murphy Yuezhen Niu Barry C. Sanders Franco N. C. Wong Jeffrey H. Shapiro Research Laboratory of Electronics Massachusetts Institute of Technology Cambridge Massachusetts 02139 USA Department of Physics Massachusetts Institute of Technology Cambridge Massachusetts 02139 USA 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 Hefei National Laboratory for Physical Sciences at the Microscale University of Science and Technology of China Anhui 230026 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 201315 China Institute for Quantum Information and Matter California Institute of Technology Pasadena California 91125 USA

We propose an optical scheme, employing optical parametric down-converters interlaced with nonlinear sign gates (NSGs), that completely converts an n-photon Fock-state pump to n signal-idler photon pairs when the down-converters’ crystal lengths are chosen appropriately. The proof of this assertion relies on amplitude amplification, analogous to that employed in Grover search, applied to the full quantum dynamics of single-mode parametric down-conversion. When we require that all Grover iterations use the same crystal, and account for potential experimental limitations on crystal-length precision, our optimized conversion efficiencies reach unity for 1≤n≤5, after which they decrease monotonically for n values up to 50, which is the upper limit of our numerical dynamics evaluations. Nevertheless, our conversion efficiencies remain higher than those for a conventional (no NSGs) down-converter.

关键词： quantum algorithms quantum state engineering Second order nonlinear optical processes

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Experimental quantum channel simulation

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Physical Review A 2017年第4期95卷 042310-042310页

作者： He Lu Chang Liu Dong-Sheng Wang Luo-Kan Chen Zheng-Da Li Xing-Can Yao Li Li Nai-Le Liu Cheng-Zhi Peng Barry C. Sanders Yu-Ao 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 Synergetic Innovation Center of Quantum Information and Quantum Physics University of Science and Technology of China Hefei Anhui 230026 China Institute for Quantum Science and Technology University of Calgary Alberta Canada T2N 1N4 Physikalisches Institut Ruprecht-Karls-Universität Heidelberg Im Neuenheimer Feld 226 69120 Heidelberg Germany Program in Quantum Information Science Canadian Institute for Advanced Research Toronto Ontario Canada M5G 1Z8

quantum simulation is of great importance in quantum information science. Here, we report an experimental quantum channel simulator imbued with an algorithm for imitating the behavior of a general class of quantum systems. The reported quantum channel simulator consists of four single-qubit gates and one controlled-not gate. All types of quantum channels can be decomposed by the algorithm and implemented on this device. We deploy our system to simulate various quantum channels, such as quantum-noise channels and weak quantum measurement. Our results advance experimental quantum channel simulation, which is integral to the goal of quantum information processing.

关键词： Open quantum systems & decoherence quantum information architectures & platforms

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Decomposition of split-step quantum walks for simulating Majorana modes and edge states

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Physical Review A 2017年第5期95卷 052351-052351页

作者： Wei-Wei Zhang Sandeep K. Goyal Christoph Simon Barry C. Sanders Hefei National Laboratory for Physical Sciences at Microscale and Department of Modern Physics University of Science and Technology of China Hefei Anhui 230026 China Institute for Quantum Science and Technology and Department of Physics and Astronomy University of Calgary Canada T2N 1N4 State Key Laboratory of Networking and Switching Technology Beijing University of Posts and Telecommunications Beijing 100876 China Department of Physical Sciences Indian Institute of Science Education and Research Mohali Sector 81 SAS Nagar Punjab 140306 India Shanghai Branch CAS Center for Excellence and Synergetic Innovation Center in Quantum Information and Quantum Physics University of Science and Technology of China Shanghai 201315 China Program in Quantum Information Science Canadian Institute for Advanced Research Toronto Ontario M5G 1Z8 Canada

We construct a decomposition procedure for converting split-step quantum walks into ordinary quantum walks with alternating coins, and we show that this decomposition enables a feasible linear optical realization of split-step quantum walks by eliminating quantum-control requirements. As salient applications, we show how our scheme will simulate Majorana modes and edge states.

关键词： Majorana fermions quantum simulation Random walks

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quantum walk on a chimera graph

arXiv

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arXiv 2017年

作者： Xu, Shu Sun, Xiangxiang Wu, Jizhou Zhang, Wei-Wei Arshed, Nigum Sanders, Barry C. Shanghai Branch National Laboratory for Physical Sciences at Microscale University of Science and Technology of China Shanghai201315 China Department of Modern Physics University of Science and Technology of China HefeiAnhui230026 China Synergetic Innovation Center of Quantum Information and Quantum Physics University of Science and Technology of China Hefei Anhui230026 China Institute for Quantum Science and Technology University of Calgary AlbertaT2N 1N4 Canada Program in Quantum Information Science Canadian Institute for Advanced Research TorontoONM5G 1Z8 Canada

We analyze a continuous-time quantum walk on a chimera graph, which is a graph of choice for designing quantum annealers, and we discover beautiful quantum walk features such as localization that starkly distinguishes classical from quantum behaviour. Motivated by technological thrusts, we study continuous-time quantum walk on enhanced variants of the chimera graph and on diminished chimera graph with a random removal of vertices. We explain the quantum walk by constructing a generating set for a suitable subgroup of graph isomorphisms and corresponding symmetry operators that commute with the quantum walk Hamiltonian;the Hamiltonian and these symmetry operators provide a complete set of labels for the spectrum and the stationary states. Our quantum walk characterization of the chimera graph and its variants yields valuable insights into graphs used for designing quantum-annealers. Copyright © 2017, The Authors. All rights reserved.

关键词： Hamiltonians

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Detecting Topological Transitions in Two Dimensions by Hamiltonian Evolution

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Physical Review Letters 2017年第19期119卷 197401-197401页

作者： Wei-Wei Zhang Barry C. Sanders Simon Apers Sandeep K. Goyal David L. Feder State Key Laboratory of Networking and Switching Technology Beijing University of Posts and Telecommunications Beijing 100876 China Hefei National Laboratory for Physical Sciences at Microscale University of Science and Technology of China Hefei Anhui 230026 China Institute for Quantum Science and Technology and Department of Physics and Astronomy University of Calgary Calgary Alberta T2N 1N4 Canada Centre for Engineered Quantum Systems School of Physics The University of Sydney Sydney NSW 2006 Australia Shanghai Branch CAS Center for Excellence and Synergetic Innovation Center in Quantum Information and Quantum Physics University of Science and Technology of China Shanghai 201315 China Program in Quantum Information Science Canadian Institute for Advanced Research Toronto Ontario M5G 1M1 Canada SYSTeMS Ghent University IR08 Technologiepark 913 B-9052 Zwijnaarde Belgium Indian Institute of Science Education and Research Mohali Punjab 140306 India

We show that the evolution of two-component particles governed by a two-dimensional spin-orbit lattice Hamiltonian can reveal transitions between topological phases. A kink in the mean width of the particle distribution signals the closing of the band gap, a prerequisite for a quantum phase transition between topological phases. Furthermore, for realistic and experimentally motivated Hamiltonians, the density profile in topologically nontrivial phases displays characteristic rings in the vicinity of the origin that are absent in trivial phases. The results are expected to have an immediate application to systems of ultracold atoms and photonic lattices.

关键词： Geometric & topological phases Topological effects in photonic systems Topological phase transition Topological materials Ultracold gases

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Relativistic (2,3)-threshold quantum secret sharing

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Physical Review D 2017年第6期96卷 065018-065018页

作者： Mehdi Ahmadi Ya-Dong Wu Barry C. Sanders Department of Mathematics and Statistics University of Calgary Calgary Alberta T2N 1N4 Canada Institute for Quantum Science and Technology University of Calgary Alberta T2N 1N4 Canada Program in Quantum Information Science Canadian Institute for Advanced Research Toronto Ontario M5G 1Z8 Canada Hefei National Laboratory for Physical Sciences at Microscale University of Science and Technology of China Hefei Anhui 230026 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 201315 China

In quantum secret sharing protocols, the usual presumption is that the distribution of quantum shares and players’ collaboration are both performed inertially. Here we develop a quantum secret sharing protocol that relaxes these assumptions wherein we consider the effects due to the accelerating motion of the shares. Specifically, we solve the (2,3)-threshold continuous-variable quantum secret sharing in noninertial frames. To this aim, we formulate the effect of relativistic motion on the quantum field inside a cavity as a bosonic quantum Gaussian channel. We investigate how the fidelity of quantum secret sharing is affected by nonuniform motion of the quantum shares. Furthermore, we fully characterize the canonical form of the Gaussian channel, which can be utilized in quantum-information-processing protocols to include relativistic effects.

关键词： quantum channels quantum cryptography quantum fields in curved spacetime

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Detecting topological invariants in non-unitary discrete-time quantum walks

arXiv

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arXiv 2017年

作者： Zhan, Xiang Xiao, Lei Bian, Zhihao Wang, Kunkun Qiu, Xingze Sanders, Barry C. Yi, Wei Xue, Peng 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 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 AlbertaT2N 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

We report the experimental detection of bulk topological invariants in non-unitary discrete-time quantum walks with single photons. The non-unitarity of the quantum dynamics is enforced by periodically performing partial measurements on the polarization of the walker photon, which effectively introduces loss to the dynamics. The topological invariant of the non-unitary quantum walk is manifested in the quantized average displacement of the walker, which is probed by monitoring the photon loss. We confirm the topological properties of the system by observing localized edge states at the boundary of regions with different topological invariants. We further demonstrate the robustness of both the topological properties and the measurement scheme of the topological invariants against disorder. Copyright © 2017, The Authors. All rights reserved.

关键词： Topology

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