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Observation of dark edge states in parity-time-symmetric quantum dynamics

National science Review 2023年第8期10卷 156-165页

作者： Peng Xue Xingze Qiu Kunkun Wang Barry C. Sanders Wei Yi Beijing Computational Science Research Center Key Laboratory of Quantum Information University of Science and Technology of China Chinese Academy of Sciences Synergetic Innovation Center in Quantum Information and Quantum Physics University of Science and Technology of China Chinese Academy of Sciences School of Physics and Optoelectronic Engineering Anhui University Shanghai Branch National Laboratory for Physical Sciences at MicroscaleUniversity of Science and Technology of China Institute for Quantum Science and Technology University of Calgary Program in Quantum Information Science Canadian Institute for Advanced Research

Topological edge states arise in non-Hermitian parity-time(PT)-symmetric systems, and manifest themselves as bright or dark edge states, depending on the imaginary components of their eigenenergies. As the spatial probabilities of dark edge states are suppressed during the non-unitary dynamics, it is a challenge to observe them experimentally. Here we report the experimental detection of dark edge states in photonic quantum walks with spontaneously broken PT symmetry, thus providing a complete description of the topological phenomena therein. We experimentally confirm that the global Berry phase in PT-symmetric quantum-walk dynamics unambiguously defines topological invariants of the system in both the PT-symmetry-unbroken and-broken regimes. Our results establish a unified framework for characterizing topology in PT-symmetric quantum-walk dynamics, and provide a useful method to observe topological phenomena in PT-symmetric non-Hermitian systems in general.

关键词： parity-time symmetry photonic quantum walks dark edge states topological invariants

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GHz Harmonic Mode-Locking from a Yb-Doped Fiber Laser with Consistently High SMSR 37

GHz Harmonic Mode-Locking from a Yb-Doped Fiber Laser with C...

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37th European Frequency and Time Forum, EFTF 2024

作者： Wang, Ya Yang, Ruoao Chen, Zhendong Pan, Duo Luo, Bin Zhang, Zhigang Chen, Jingbiao Beijing University of Posts and Telecommunications State Key Laboratory of Information Photonics and Optical Communications Beijing100876 China School of Electronics Peking University State Key Laboratory of Advanced Optical Communication Systems and Networks Beijing100871 China Innovation Program for Quantum Science and Technology Hefei National Laboratory Hefei230088 China

We built a mode-locked laser with a base frequency of 150 MHz, which can achieve 7th harmonic mode-locking up to 1.05 GHz by fine-tuning the polarization device in the cavity with high super mode suppression ratio ove... 详细信息

ISBN: (纸本)9798350354270

关键词： Mode-locked fiber lasers

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Quaternary ammonium-functionalized polysilsesquioxanes for antifogging coating

RSC Applied Polymers

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RSC Applied Polymers 2024年第1期3卷 92-96页

作者： Hamada, Takashi Sugimoto, Tetsuya Tanaka, Arata Maeda, Tetsuya Katsura, Daiji Koga, Hiroyuki Ohshita, Joji Collaborative Research Laboratory Graduate School of Advanced Science and Engineering Hiroshima University 1-4-1 Kagamiyama Higashi-Hiroshima Hiroshima 739-8527 Japan Quantum Materials and Applications Research Center Takasaki Institute for Advanced Quantum Science National Institutes for Quantum Science and Technology (QST) 1233 Watanuki-machi Takasaki Gunma 370-1292 Japan Technical Research Center Mazda Motor Corporation Aki-gun Hiroshima 730-8670 Japan Smart Innovation Program Graduate School of Advanced Science and Engineering Hiroshima University 1-4-1 Kagamiyama Higashi-Hiroshima Hiroshima 739-8527 Japan Division of Materials Model-Based Research Digital Monozukuri (Manufacturing) Education and Research Center Hiroshima University 3-10-32 Kagamiyama Higashi-Hiroshima Hiroshima 739-0046 Japan

Aiming to develop antifogging materials with enhanced antifogging properties and scratch resistance, polysilsesquioxane films containing quaternary ammonium groups were prepared via a sol-gel reaction and quaternization. Owing to their high water uptake, scratch hardness, and transparency, the prepared quaternary ammonium-functionalized polysilsesquioxane films are promising for application in antifogging coatings. © 2025 RSC.

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GHz Harmonic Mode-Locking from a Yb-Doped Fiber Laser with Consistently High SMSR

GHz Harmonic Mode-Locking from a Yb-Doped Fiber Laser with C...

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European Frequency and Time Forum (EFTF)

作者： Ya Wang Ruoao Yang Zhendong Chen Duo Pan Bin Luo Zhigang Zhang Jingbiao Chen State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and Telecommunications Beijing China State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Peking University Beijing China Hefei National Laboratory Innovation Program for Quantum Science and Technology Hefei China

ISBN: (数字)9798350354270

ISBN: (纸本)9798350354287

关键词： Optical fiber polarization Time-frequency analysis Laser mode locking Europe Harmonic analysis Optical fiber devices Fiber lasers

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中心对称且具有非简单空间群结构的晶体中可调控的Dzyaloshinskii-Moriya相互作用

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science Bulletin 2023年第11期68卷 1113-1118,M0003页

作者：张中义秦盛山臧佳栋方辰胡江平张富春 Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China School of Physics Beijing Institute of TechnologyBeijing 100081China Kavli Institute for Theoretical Sciences CAS Center for Excellence in Topological Quantum ComputationUniversity of Chinese Academy of SciencesBeijing 100190China Department of Physics and Astronomy University of New HampshireDurham 03824USA Materials Science Program University of New HampshireDurham 03824USA South Bay Interdisciplinary Science Center Dongguan 523808China Collaborative Innovation Center of Advanced Microstructures Nanjing UniversityNanjing 210093China

非中心对称材料中存在的Dzyaloshinskii-Moriya(DM)相互作用,可以导致新颖的自旋纹理和奇异的手性物理现象.而如果能在中心对称的晶格中发现DM相互作用,这将可以大大丰富实现上述新奇物理的材料体系.本文发现中心对称的且遵循非简单空... 详细信息

非中心对称材料中存在的Dzyaloshinskii-Moriya(DM)相互作用,可以导致新颖的自旋纹理和奇异的手性物理现象.而如果能在中心对称的晶格中发现DM相互作用,这将可以大大丰富实现上述新奇物理的材料体系.本文发现中心对称的且遵循非简单空间群结构的巡游电子体系可以作为实现DM相互作用的新平台.以遵循P4/nmn空间群的晶格为例,作者展示了在该中心对称晶格中,由巡游电子导致的Ruderman-Kittel-Kasuya-Yosida(RKKY)相互作用中包含DM相互作用、Heisenberg交换相互作用和Kaplan-Shekhtman-Entin-wohlman-Aharony(KSEA)相互作用.在这其中,DM相互作用的DM矢量的方向取决于实空间中磁性原子的位置,DM相互作用的强度取决于动量空间中费米面的位置.该晶格体系中磁性相互作用的多样性,源于非简单空间群对称性保证的实空间中位置依赖的在位点群和倒空间中动量依赖的电子结构.本研究揭示了非简单空间群对称性如何影响晶体中的磁性,表明非简单空间群晶格体系是设计磁性相互作用非常有前景的平台.

关键词：巡游电子中心对称物理现象动量空间费米面磁性原子

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Polarization entanglement enabled by orthogonally stacked van der Waals NbOCl2 crystals

arXiv

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arXiv 2024年

作者： Guo, Qiangbing Wu, Yun-Kun Zhang, Di Zhang, Qiuhong Guo, Guang-Can Alù, Andrea Ren, Xi-Feng Qiu, Cheng-Wei Department of Electrical and Computer Engineering National University of Singapore Singapore Singapore Centre for Advanced 2D Materials Graphene Research Centre National University of Singapore Singapore Singapore CAS Key Laboratory of Quantum Information CAS Synergetic Innovation Center of Quantum Information & Quantum Physics University of Science and Technology of China Hefei China Hefei National Laboratory University of Science and Technology of China Hefei China Photonics Initiative Advanced Science Research Center City University of New York New York United States Physics Program Graduate Center City University of New York New York United States The Key Laboratory of Weak-Light Nonlinear Photonics Ministry of Education School of Physics TEDA Applied Physics Institute Nankai University Tianjin China School of Chemistry and Materials Science Hangzhou Institute for Advanced Study University of Chinese Academy of Sciences Hangzhou China

Polarization entanglement holds significant importance for photonic quantum technologies. Recently emerging subwavelength nonlinear quantum light sources, e.g., GaP and LiNbO3 thin films, benefiting from the relaxed phase-matching constraints and volume confinement, has shown intriguing properties, such as high-dimensional hyperentanglement and robust entanglement anti-degradation. Van der Waals (vdW) NbOCl2 crystal, renowned for its superior optical nonlinearities, has emerged as one of ideal candidates for ultrathin quantum light sources [Nature 613, 53 (2023)]. However, polarization-entanglement is inaccessible in NbOCl2 crystal due to its unfavorable nonlinear susceptibility tensor. Here, by leveraging the twist-stacking degree of freedom inherently in vdW systems, we showcase the preparation of tunable polarization entanglement and quantum Bell states. Our work not only provides a new and tunable polarization-entangled vdW photon-pair source, but also introduces a new knob in engineering the entanglement state of quantum light at the nanoscale. © 2024, CC BY-NC-ND.

关键词： Van der Waals forces

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Imaginary Hamiltonian variational Ansatz for combinatorial optimization problems

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Physical Review A 2025年第3期111卷 032612-032612页

作者： Xiaoyang Wang Yahui Chai Xu Feng Yibin Guo Karl Jansen Cenk Tüysüz School of Physics Peking University Beijing 100871 China Collaborative Innovation Center of Quantum Matter Beijing 100871 China Center for High Energy Physics Peking University Beijing 100871 China Interdisciplinary Theoretical and Mathematical Sciences Program RIKEN Wako 351-0198 Japan Deutsches Elektronen-Synchrotron DESY Platanenallee 6 15738 Zeuthen Germany Computation-Based Science and Technology Research Center Cyprus Institute 20 Kavafi Street 2121 Nicosia Cyprus Institut für Physik Humboldt-Universität zu Berlin Newtonstraße 15 12489 Berlin Germany

Obtaining exact solutions to combinatorial optimization problems using classical computing is computationally expensive. The current tenet in the field is that quantum computers can address these problems more efficiently. While promising algorithms require fault-tolerant quantum hardware, variational algorithms have emerged as viable candidates for near-term devices. The success of these algorithms hinges on multiple factors, with the design of the Ansatz being of the utmost importance. It is known that popular approaches such as the quantum approximate optimization algorithm (QAOA) and quantum annealing suffer from adiabatic bottlenecks, which lead to either larger circuit depth or evolution time. On the other hand, the evolution time of imaginary-time evolution is bounded by the inverse energy gap of the Hamiltonian, which is constant for most noncritical physical systems. In this work we propose an imaginary Hamiltonian variational Ansatz (iHVA) inspired by quantum imaginary-time evolution to solve the MaxCut problem. We introduce a tree arrangement of the parametrized quantum gates, enabling the exact solution of arbitrary tree graphs using the one-round iHVA. For randomly generated D-regular graphs, we numerically demonstrate that the iHVA solves the MaxCut problem with a small constant number of rounds and sublinear depth, outperforming the QAOA, which requires rounds increasing with the graph size. Furthermore, our Ansatz solves the MaxCut problem exactly for graphs with up to 24 nodes and D≤5, whereas only approximate solutions can be derived by the classical near-optimal Goemans-Williamson algorithm. We validate our simulated results with hardware demonstrations on a graph with 67 nodes.

关键词： Combinatorial optimization

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Spin-tunable thermoelectric performance in monolayer chromium pnictides

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Physical Review Materials 2022年第6期6卷 064010-064010页

作者： Melania S. Muntini Edi Suprayoga Sasfan A. Wella Iim Fatimah Lila Yuwana Tosawat Seetawan Adam B. Cahaya Ahmad R. T. Nugraha Eddwi H. Hasdeo Department of Physics Faculty of Science and Data Analytics Institut Teknologi Sepuluh Nopember Surabaya 60111 Indonesia Research Center for Quantum Physics National Research and Innovation Agency Tangerang Selatan 15314 Indonesia Center of Excellence on Alternative Energy Research and Development Institution Sakon Nakhon Rajabhat University Sakon Nakhon 47000 Thailand Program of Physics Faculty of Science and Technology Sakon Nakhon Rajabhat University Sakon Nakhon 47000 Thailand Department of Physics Faculty of Mathematics and Natural Sciences Universitas Indonesia Depok 16424 Indonesia Department of Physics and Materials Science University of Luxembourg L-1511 Luxembourg

Historically, finding two-dimensional (2D) magnets is well known to be a difficult task due to the instability against thermal spin fluctuations. Metals are also normally considered poor thermoelectric (TE) materials. Combining intrinsic magnetism in two dimensions with conducting properties, one may expect to get the worst for thermoelectrics. However, we will show this is not always the case. Here, we investigate the spin-dependent TE properties of monolayer chromium pnictides (CrX, where X=P, As, Sb, and Bi) using first-principles calculations of electron- and phonon-energy dispersion, along with the Boltzmann transport formalism under an energy-dependent relaxation time approximation. All the CrX monolayers are dynamically stable and they also exhibit half metallicity with ferromagnetic ordering. Using the spin-valve setup with an antiparallel spin configuration, the half metallicity and ferromagnetism in monolayer CrX enable the manipulation of spin degrees of freedom to tune the TE figure of merit (ZT). At an optimized chemical potential and operating temperature of 500 K, the maximum ZT values (≈0.22, 0.12, and 0.09) with the antiparallel spin-valve setup in CrAs, CrSb, and CrBi improve up to almost twice the original values (ZT≈0.12, 0.08, and 0.05) without the spin-valve configuration. Only in CrP, which is the lightest species and less spin polarized among CrX, the maximum ZT (≈0.34) without the spin-valve configuration is larger than that (≈0.19) with the spin-valve one. We also find that, at 500 K, all the CrX monolayers possess exceptional TE power factors of about 0.02–0.08 W/m K2, which could be one of the best values among 2D conductors.

关键词： First-principles calculations Thermopower Monolayer films Electronic structure

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Modeling phonon-mediated quasiparticle poisoning in superconducting qubit arrays

arXiv

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arXiv 2024年

作者： Yelton, Eric Larson, Clayton P. Iaia, Vito Dodge, Kenneth La Magna, Guglielmo Baity, Paul G. Pechenezhskiy, Ivan V. McDermott, Robert Kurinsky, Noah A. Catelani, Gianluigi Plourde, Britton L.T. Department of Physics Syracuse University SyracuseNY13244-1130 United States Intelligence Community Postdoctoral Research Fellowship Program Department of Physics Syracuse University SyracuseNY13244-1130 United States Forschungszentrum Jülich Jülich52425 Germany Quantum Research Center Technology Innovation Institute Abu Dhabi9639 United Arab Emirates Computational Science Initiative Brookhaven National Laboratory UptonNY11973 United States Department of Physics University of Wisconsin-Madison MadisonWI53706 United States Kavli Institute for Particle Astrophysics and Cosmology SLAC National Accelerator Laboratory Menlo ParkCA94025 United States

Correlated errors caused by ionizing radiation impacting superconducting qubit chips are problematic for quantum error correction. Such impacts generate quasiparticle (QP) excitations in the qubit electrodes, which temporarily reduce qubit coherence significantly. The many energetic phonons produced by a particle impact travel efficiently throughout the device substrate and generate quasiparticles with high probability, thus causing errors on a large fraction of the qubits in an array simultaneously. We describe a comprehensive strategy for the numerical simulation of the phonon and quasiparticle dynamics in the aftermath of an impact. We compare the simulations with experimental measurements of phonon-mediated QP poisoning and demonstrate that our modeling captures the spatial and temporal footprint of the QP poisoning for various configurations of phonon downconversion structures. We thus present a path forward for the operation of superconducting quantum processors in the presence of ionizing radiation. Copyright © 2024, The Authors. All rights reserved.

关键词： Qubits

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Demonstration of an Exponential Advantage in Communication Complexity via the quantum Switch

Demonstration of an Exponential Advantage in Communication C...

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Pacific Rim Conference on Lasers and Electro-Optics (CLEO/Pacific Rim)

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

The quantum switch is a tool that allows coherently controlling the order in which two operations are applied. We report the first experimental demonstration of the exponential advantage in communication complexity en... 详细信息

ISBN: (数字)9781728143330

ISBN: (纸本)9781728152394

关键词： Protocols Qubit Power lasers Switches Tools Complexity theory Photonics

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