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arXiv 2024年

作者： Shi, Fei Guo, Kaiyi Zhang, Xiande Zhao, Qi QICI Quantum Information and Computation Initiative Department of Computer Science The University of Hong Kong Pokfulam Road Hong Kong School of Physics Peking University Beijing100871 China School of Mathematical Sciences University of Science and Technology of China Hefei230026 China Hefei National Laboratory University of Science and Technology of China Hefei230088 China

Quantum weight enumerators play a crucial role in quantum error-correcting codes and multipartite entanglement. They can be used to investigate the existence of quantum error-correcting codes and k-uniform states. In this work, we build the connection between quantum weight enumerators and the n-qubit parallelized SWAP test. We discover that each shadow enumerator corresponds precisely to a probability in the n-qubit parallelized SWAP test, providing a computable and operational meaning for the shadow enumerators. Due to the non-negativity of probabilities, we obtain an elegant proof for the shadow inequalities. Concurrently, we can also calculate the Shor-Laflamme enumerators and the Rains unitary enumerators from the n-qubit parallelized SWAP test. For applications, we employ the n-qubit parallelized SWAP test to determine the distances of quantum error-correcting codes, and the k-uniformity of pure states. Our results indicate that quantum weight enumerators can be efficiently estimated on quantum computers, and opening a path to calculate the distances of quantum error-correcting codes. © 2024, CC BY.

关键词： Quantum entanglement

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Exceptional Entanglement Phenomena: Non-Hermiticity Meeting Nonclassicality

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Physical Review Letters 2023年第26期131卷 260201-260201页

作者： Pei-Rong Han Fan Wu Xin-Jie Huang Huai-Zhi Wu Chang-Ling Zou Wei Yi Mengzhen Zhang Hekang Li Kai Xu Dongning Zheng Heng Fan Jianming Wen Zhen-Biao Yang Shi-Biao Zheng Fujian Key Laboratory of Quantum Information and Quantum Optics College of Physics and Information Engineering Fuzhou University Fuzhou Fujian 350108 China CAS Key Laboratory of Quantum Information University of Science and Technology of China Hefei 230026 China CAS Center for Excellence in Quantum Information and Quantum Physics University of Science and Technology of China Hefei 230026 China Hefei National Laboratory Hefei 230088 China Pritzker School of Molecular Engineering University of Chicago Chicago Illinois 60637 USA Institute of Physics Chinese Academy of Sciences Beijing 100190 China CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of Sciences Beijing 100190 China Department of Physics Kennesaw State University Marietta Georgia 30060 USA

Non-Hermitian (NH) extension of quantum-mechanical Hamiltonians represents one of the most significant advancements in physics. During the past two decades, numerous captivating NH phenomena have been revealed and demonstrated, but all of which can appear in both quantum and classical systems. This leads to the fundamental question: what NH signature presents a radical departure from classical physics? The solution of this problem is indispensable for exploring genuine NH quantum mechanics, but remains experimentally untouched so far. Here, we resolve this basic issue by unveiling distinct exceptional entanglement phenomena, exemplified by an entanglement transition, occurring at the exceptional point of NH interacting quantum systems. We illustrate and demonstrate such purely quantum-mechanical NH effects with a naturally dissipative light-matter system, engineered in a circuit quantum electrodynamics architecture. Our results lay the foundation for studies of genuinely quantum-mechanical NH physics, signified by exceptional-point-enabled entanglement behaviors.

关键词： Open quantum systems & decoherence Quantum control Quantum foundations Quantum measurements Quantum metrology Non-Hermitian systems

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A New Authentication Protocol for Wireless Communication Network Based on IEEE802.16

A New Authentication Protocol for Wireless Communication Net...

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International Symposium on Parallel and Distributed Processing with Applications, ISPA

作者： Ruixue Li Zhiyi Fang Wei Cao Yumei Yin Peng Xu College of Computer Science and Technology Jilin University Key Laboratory of Symbolic Computation and Knowledge Engineering of Ministry of Education Changchun China College of Information Technology Liaodong University Dandong China Changchun Institute of Optics Fine Mechanics and Physics Chinese Academy and Sciences Changchun China

After analyzing the specific security requirements of the wireless communication network based on IEEE802.16, a series of key issues about security methods and techniques were researched. A new authentication protocol for wireless mobile environment was proposed and designed. Then, its security was analyzed from the angle of technical realization and formal analysis to verify whether the original safety goals were achieved. Especially, formal analysis was mostly done. Finally, system testing was also carried out and the results were analyzed to verify function and performance of the new protocol.

关键词： Authentication Wireless application protocol Wireless communication Communication system security Information security Data security Safety Access protocols Clocks Synchronization

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Tensor Rank and Stochastic Entanglement Catalysis for Multipartite Pure States

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Physical Review Letters 2010年第20期105卷 200501-200501页

作者： Lin Chen Eric Chitambar Runyao Duan Zhengfeng Ji Andreas Winter Centre for Quantum Technologies National University of Singapore 3 Science Drive 2 Singapore 117542* Physics Department University of Michigan 450 Church Street Ann Arbor Michigan 48109-1040 USA Centre for Quantum Computation and Intelligent Systems (QCIS) Faculty of Engineering and Information Technology University of Technology Sydney New South Wales 2007 Australia State Key Laboratory of Intelligent Technology and Systems Tsinghua National Laboratory for Information Science and Technology Department of Computer Science and Technology Tsinghua University Beijing 100084 China Perimeter Institute for Theoretical Physics Waterloo Ontario N2L 2Y5 Canada Department of Mathematics University of Bristol Bristol BS8 1TW United Kingdom

The tensor rank (also known as generalized Schmidt rank) of multipartite pure states plays an important role in the study of entanglement classifications and transformations. We employ powerful tools from the theory of homogeneous polynomials to investigate the tensor rank of symmetric states such as the tripartite state |W3⟩=13(|100⟩+|010⟩+|001⟩) and its N-partite generalization |WN⟩. Previous tensor rank estimates are dramatically improved and we show that (i) three copies of |W3⟩ have a rank of either 15 or 16, (ii) two copies of |WN⟩ have a rank of 3N−2, and (iii) n copies of |WN⟩ have a rank of O(N). A remarkable consequence of these results is that certain multipartite transformations, impossible even probabilistically, can become possible when performed in multiple-copy bunches or when assisted by some catalyzing state. This effect is impossible for bipartite pure states.

关键词： Tensors

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First order corrections to black hole thermodynamics: a simple approach enhanced

arXiv

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arXiv 2023年

作者： Xiao, Yong Liu, Yue-Ying Key Laboratory of High-precision Computation Application of Quantum Field Theory of Hebei Province College of Physical Science and Technology Hebei University Baoding071002 China Hebei Research Center of the Basic Discipline for Computational Physics Baoding071002 China

The inclusion of higher derivative terms in the gravitational action brings about corrections to the original forms of black hole solutions and thermodynamics. A simple and valuable approach has emerged over two decades ago, which states that the first order corrections to black hole thermodynamics, caused by higher derivative terms, can be achieved without explicitly solving the perturbed metric. However, a direct application of this approach may potentially yield incorrect answers as it comes to AdS black holes, which poses a challenge to the valuable approach. In this paper, we identify the subtlety associated with AdS black holes is that certain higher derivative terms may alter the asymptotic structure of the spacetime. By taking this subtlety into account, we successfully enhance the original approach and resolve the mentioned problem. Furthermore, we make an interesting observation that the extremalization analysis that underlies this approach also plays a fundamental role in the perturbation theories of quantum mechanics and other disciplines. Copyright © 2023, The Authors. All rights reserved.

关键词： Perturbation techniques

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Two-dimensional Weyl half-semimetal and tunable quantum anomalous Hall effect

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Physical Review B 2019年第6期100卷 064408-064408页

作者： Jing-Yang You Cong Chen Zhen Zhang Xian-Lei Sheng Shengyuan A. Yang Gang Su School of Physical Sciences University of Chinese Academy of Sciences Beijing 100049 China Department of Physics Key Laboratory of Micro-nano Measurement-Manipulation and Physics (Ministry of Education) Beihang University Beijing 100191 China Research Laboratory for Quantum Materials Singapore University of Technology and Design Singapore 487372 Singapore Center for Quantum Transport and Thermal Energy Science School of Physics and Technology Nanjing Normal University Nanjing 210023 China Kavli Institute for Theoretical Sciences and CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of Sciences Beijing 100190 China

Topological states of matter and two-dimensional (2D) magnetism are two fascinating topics attracting tremendous interest in current research. In this work, we explore their interplay in a single 2D material system by proposing a different topological quantum state of matter—the 2D Weyl half-semimetal (WHS), which features 2D Weyl points at the Fermi level belonging to a single spin channel, such that the low-energy electrons are described by fully spin polarized 2D Weyl fermions. We provide the condition to realize this state, which requires an in-plane magnetization and a preserved vertical mirror symmetry. Remarkably, we prove that the WHS state is a critical state sitting at the topological phase transition between two quantum anomalous Hall (QAH) insulator phases with opposite Chern numbers, such that a switching of the QAH states as well as the direction of chiral edge channels can be readily achieved by rotating the magnetization direction. Furthermore, we predict a concrete 2D material, monolayer PtCl3, as a candidate for realizing the 2D WHS state and the above intriguing effects. Our findings open up a new direction of research at the confluent point of topology and magnetism in two dimensions, and the revealed route towards switchable QAH phases will enable new designs of topological nanoelectronic devices.

关键词： Ferromagnetism Quantum anomalous Hall effect Symmetry protected topological states Topological phase transition Weyl fermions

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Photoluminescence Properties and Mn4+ → Tm3+ Energy Transfer of La0.557li0.33tio3: Mn4+, Tm3+ for Thermometry and Nir-Led Applications

SSRN

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SSRN 2024年

作者： Fu, Nian Liu, Ni Yin, Tao Jin, Hao Liu, Zhenyang Wang, Dawei Guan, Li Wang, Fenghe Li, Xu Hebei Key Laboratory of Photo-Electricity Information and Materials College of Physics Science and Technology Hebei University Baoding071002 China Key Laboratory of High-precision Computation Application of Quantum Field Theory of Hebei Province Hebei University Baoding071002 China Hebei University China

Over the span of years, Mn4+-doped red phosphors have been utilized to meaningful optoelectronic devices due to their outstanding optical properties, and Tm3+ usually is an activator ion because of its efficient up-conversion emission, but inverse processes are rarely used. Herein, we have successful synthesized a series of novel La0.557Li0.33Ti1-xO3:xMn4+ (x = 0.1%-7%) phosphors. The photoluminescence properties have been detailed analysis. Using Mn4+-Tm3+ co-doped strategy, we successfully synthesis La0.557-yLi0.33Ti0.993O3:0.7%Mn4+, yTm3+ phosphors. upon excitation with 360 nm light, it exhibits two distinct emission peaks at 729 nm and 806 nm. The emission intensity of Tm3+ was greatly improved after Mn4+ doping, which is due to the energy transfer of Mn4+ to Tm3+. In terms of potential applications, utilizing fluorescence intensity ratio technology, La0.551Li0.33Ti0.993O3:0.7%Mn4+,0.6%Tm3+ exhibits maximum absolute and relative sensitivities of 3.25% K-1 and 3.49% K-1, thereby demonstrating its potential for application in optical thermometry. Furthermore, The NIR-LED using phosphor and 365 nm chips reveal potential applications of the La0.551Li0.33Ti0.993O3:Mn4+,Tm3+ phosphor in NIR night vision and biosensing. © 2024, The Authors. All rights reserved.

关键词： Energy transfer

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手性晶体CoSi中拓扑费米弧的电荷不稳定性

引用

science Bulletin 2023年第2期68卷 165-172,M0003页

作者：饶志成胡全欣田尚杰曲青陈聪润高顺业袁震宇唐岑瑶樊文辉黄杰瑞黄耀波王利张露李坊森王克东杨槐馨翁红明钱天徐金朋蒋坤雷和畅孙煜杰丁洪 Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of SciencesBeijing 100190China Department of Physics Southern University of Science and TechnologyShenzhen 518055China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China School of Materials Science and Engineering Anhui UniversityHefei 230601China Laboratory for Neutron Scattering and Beijing Key Laboratory of Optoelectronic Functional Materials MicroNano DevicesDepartment of PhysicsRenmin University of ChinaBeijing 100872China Shanghai Synchrotron Radiation Facility Shanghai Advanced Research InstituteChinese Academy of SciencesShanghai 201204China Vacuum Interconnected Nanotech Workstation(Nano-X) Suzhou Institute of Nano-Tech and Nano-Bionics(SINANO)Chinese Academy of SciencesSuzhou 215123China Songshan Lake Materials Laboratory Dongguan 523808China CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of SciencesBeijing 100190China

拓扑边界态出现在拓扑非平庸态和平庸态之间的边界上,通常是无间隙的或被称为金属态.例如,拓扑绝缘体的表面态是无间隙的狄拉克态.这些金属拓扑边界态往往可以被近自由费米子很好的描述.如果拓扑边界态具有显著的电子-电子相互作用的行... 详细信息

拓扑边界态出现在拓扑非平庸态和平庸态之间的边界上,通常是无间隙的或被称为金属态.例如,拓扑绝缘体的表面态是无间隙的狄拉克态.这些金属拓扑边界态往往可以被近自由费米子很好的描述.如果拓扑边界态具有显著的电子-电子相互作用的行为,无间隙的边界态会转变为有间隙的有序态,例如密度波态或超导态,这在理论上是非常有趣的,但目前还缺少相关的实验证据.本文报道了在Co Si(001)表面观察到了电子-电子相互作用驱动的、在拓扑边界态上形成的非公度电荷密度波(CDW). CDW的波矢随温度的变化而变化,这与拓扑表面费米弧随温度的演化相吻合. CDW相的取向由费米弧的手性决定,这暗示了CDW与费米弧之间存在直接的联系.该发现将促进在拓扑材料边界上寻找更多相互作用驱动的有序态,例如超导和磁性.

关键词：电荷密度波有序态拓扑绝缘体超导态狄拉克金属态表面态

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Tunable vortex Majorana modes controlled by strain in homogeneous LiFeAs

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Quantum Frontiers 2022年第1期1卷 1-9页

作者： Liu, Wenyao Hu, Quanxin Wang, Xiancheng Zhong, Yigui Yang, Fazhi Kong, Lingyuan Cao, Lu Li, Geng Peng, Yi Okazaki, Kozo Kondo, Takeshi Jin, Changqing Xu, Jinpeng Gao, Hong-Jun Ding, Hong Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of Sciences Beijing 100190 China School of Physical Sciences University of Chinese Academy of Sciences Beijing 100190 China Institute for Solid State Physics University of Tokyo Chiba Kashiwa 277-8581 Japan Songshan Lake Materials Laboratory Guangdong Dongguan 523808 China CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of Sciences Beijing 100190 China Material Innovation Research Center The University of Tokyo Chiba Kashiwa 277-8561 Japan Trans-scale Quantum Science Institute The University of Tokyo Tokyo Bunkyo-ku 113-0033 Japan Tsung-Dao Lee Institute Shanghai Jiao Tong University Shanghai 201210 China Laboratory for Assembly and Spectroscopy of Emergence Boston College Chestnut Hill 02467 MA United States T. J. Watson Laboratory of Applied Physics & amp Institute for Quantum Information and Matter California Institute of Technology Pasadena CA United States

The iron-based superconductors (FeSCs) have recently emerged as a promising single-material Majorana platform by hosting isolated Majorana zero modes (MZMs) at relatively high temperatures. To further verify its Majorana nature and move forward to build topological quantum qubits, it is highly desirable to achieve tunability for MZMs on homogeneous FeSCs. Here, with an in-situ strain device, we can controllably create MZMs on the homogeneous surface of stoichiometric superconductor LiFeAs by altering its chemical potential. The evolution of discrete energy modes inside a strained vortex is found to mimic exactly as the predicted topological vortex case, proving the Majorana nature of emerging zero modes of vortex. More importantly, our work provides a controllable method for MZM in a homogeneous FeSC, and such achievement of tunability of MZMs in the FeSC Majorana-material platform is an important step towards their application in topological quantum computation. © The Author(s) 2022.

关键词： Iron-based superconductor Majorana zero modes Topological superconductor Uniaxial strain control

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Summary of Lagrangrian Transport Models of Radionuclides in the Marine Environment 30

Summary of Lagrangrian Transport Models of Radionuclides in ...

引用

30th International Conference on Nuclear Engineering, ICONE 2023

作者： Qu, Zhengzhe Nie, Baojie Wang, Liang Fan, Zhixiang Fu, Jia Fan, Qunchao Xie, Feng Institute of Nuclear and New Energy Technology Collaborative Innovation Center of Advanced Nuclear Energy Technology Key Laboratory of Advanced Reactor Engineering and Safety of Ministry of Education Tsinghua University Beijing100084 China School of Nuclear Science and Engineering Shanghai Jiao Tong University Shanghai200240 China Nuclear and Radiation Safety Center Ministry of Ecology and Environment Beijing100082 China State Environmental Protection Key Laboratory of Nuclear and Radiation Safety Regulatory Simulation and Validation Beijing100082 China School of Physics and Chemistry Research Center for Advanced Computation Xihua University Chengdu610039 China

ISBN: (纸本)9784888982566

The transport of radionuclides in the marine has been a hot issue of social concern since the Fukushima accident, especially the Japanese government announced to discharge the wastewater from Fukushima Daiichi Nuclear Power Plant (FDNPP) into Pacific Ocean in 2021, which can directly affect the environment and human health. Regarding inland nuclear power plants, freshwater habitats such as reservoirs and rivers could also be polluted by the radioactive effluents. An adequate model is expected to be instrumental in assessing radioactive pollution in various water environments. Scientists have proposed various models to simulate the advection and diffusion of radionuclides released by the Fukushima nuclear accident in the marine in different marine environmental conditions. In this study, the behaviors of radionuclides in water bodies are introduced, including advection, turbulent mixing, decay, and interaction with sedimentss and biota. The processes of Lagrangian models, which are commonly used to simulate the transport of radionuclides in the marine, are explained in detail. The research progress and application examples of radionuclide transport models in rivers and marines in recent years are systematically summarized. Current research can provide suggestions for the development of numerical models for describing the transport behavior of radionuclides in the marine environment. © 2023 by JSME.

关键词： Radioisotopes

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