检索结果-内蒙古大学图书馆

Majorana polarization in non-Hermitian topological superconductors

Physical Review B 2021年第13期103卷 134507-134507页

作者： Zhen-Hua Wang Fuming Xu Lin Li Dong-Hui Xu Wei-Qiang Chen Bin Wang Shenzhen Key Laboratory of Advanced Thin Films and Applications College of Physics and Optoelectronic Engineering Shenzhen University Shenzhen 518060 China Center for Quantum Computing Peng Cheng Laboratory Shenzhen 518055 China College of Physics and Electronic Engineering and Center for Computational Sciences Sichuan Normal University Chengdu 610068 China Department of Physics Hubei University Wuhan 430062 China Department of Physics and Shenzhen Key Laboratory of Advanced Quantum Functional Materials and Devices Southern University of Science and Technology Shenzhen 518055 China Institute for Quantum Science and Engineering Southern University of Science and Technology Shenzhen 518055 China

Topological invariants play an important role in characterizing topological phases. However, the topological invariants of Hermitian systems usually fail to characterize non-Hermitian topological systems due to non-Hermiticity. In this work, we generalize the Majorana polarization, which is initially defined to describe Hermitian topological superconductors, as a topological edge invariant to characterize the non-Hermitian topological superconductors. The definition of the generalized Majorana polarization depends upon two inequivalent particle-hole symmetries in non-Hermitian systems. The spinless Kitaev chain model and topological superconductor model on the honeycomb lattice are considered to examine the reliability and validity of the generalized Majorana polarization. We find that the phase transitions obtained by using Majorana polarization are consistent with the commonly used complex-energy point gap descriptions, which indicates the Majorana polarization is a reliable topological invariant to characterize the topological phase transition in non-Hermitian topological superconductors. In addition, the non-Hermitian skin effect on Majorana bound states in non-Hermitian topological superconductors is also discussed.

关键词： Majorana bound states Skin effect Topological phase transition Honeycomb lattice Kitaev model Tight-binding model

来源：评论

学校读者我要写书评

暂无评论

Pseudo Landau levels, negative strain resistivity, and enhanced thermopower in twisted graphene nanoribbons

引用

Physical Review Research 2021年第3期3卷 033139-033139页

作者： Zheng Shi Hai-Zhou Lu Tianyu Liu Dahlem Center for Complex Quantum Systems and Physics Department Freie Universität Berlin 14195 Berlin Germany Institute for Quantum Computing and Department of Physics and Astronomy University of Waterloo Waterloo Ontario N2L 3G1 Canada Institute for Quantum Science and Engineering and Department of Physics Southern University of Science and Technology Shenzhen 518055 China Shenzhen Key Laboratory of Quantum Science and Engineering Shenzhen 518055 China Max-Planck-Institut für Physik komplexer Systeme 01187 Dresden Germany

As a canonical response to the applied magnetic field, the electronic states of a metal are fundamentally reorganized into Landau levels. In Dirac metals, Landau levels can be expected without magnetic fields, provided that an inhomogeneous strain is applied to spatially modulate electron hoppings in a way similar to the Aharonov-Bohm phase. We here predict that a twisted zigzag nanoribbon of graphene exhibits strain-induced pseudo Landau levels of unexplored but analytically solvable dispersions at low energies. The presence of such dispersive pseudo Landau levels results in a negative strain resistivity characterizing the (1+1)-dimensional chiral anomaly if partially filled and can greatly enhance the thermopower when fully filled.

关键词： Elastic deformation Landau levels Strain Transport phenomena Graphene

来源：评论

学校读者我要写书评

暂无评论

quantum arbitrary waveform generator

arXiv

引用

arXiv 2022年

作者： Takase, Kan Kawasaki, Akito Jeong, Byung Kyu Kashiwazaki, Takahiro Kazama, Takushi Enbutsu, Koji Watanabe, Kei Umeki, Takeshi Miki, Shigehito Terai, Hirotaka Yabuno, Masahiro China, Fumihiro Asavanant, Warit Endo, Mamoru Yoshikawa, Jun-Ichi Furusawa, Akira Department of Applied Physics School of Engineering The University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo113-8656 Japan Optical Quantum Computing Research Team RIKEN Center for Quantum Computing 2-1 Hirosawa Saitama Wako351-0198 Japan NTT Device Technology Labs NTT Corporation 3-1 Morinosato Wakamiya Kanagawa Atsugi243-0198 Japan Advanced ICT Research Institute National Institute of Information and Communications Technology 588-2 Iwaoka Nishi-ku Hyogo Kobe651-2492 Japan Graduate School of Engineering Kobe University 1-1 Rokkodai-cho Nada-ku Hyogo Kobe657-0013 Japan

Controlling the waveform of light is the key for a versatile light source in classical and quantum electronics. Although pulse shaping of classical light is a mature technique and has been used in various fields, more advanced applications would be realized by a light source that generates arbitrary quantum light with arbitrary temporal waveform. We call such a device a quantum arbitrary waveform generator (Q-AWG). The Q-AWG must be able to handle versatile quantum states of light, which are fragile. Thus, the Q-AWG requires a radically different methodology from classical pulse shaping. In this paper, we invent an architecture of Q-AWGs that can operate semi-deterministically at a repetition rate over GHz in principal. We demonstrate its core technology via generating highly non-classical states with waveforms that have never been realized before. This result would lead to powerful quantum technologies based on Q-AWGs such as practical optical quantum computing. © 2022, CC BY.

关键词： Waveform analysis

来源：评论

学校读者我要写书评

暂无评论

Topological Temporally Mode-Locked Laser

arXiv

引用

arXiv 2022年

作者： Leefmans, Christian R. Parto, Midya Williams, James Li, Gordon H.Y. Dutt, Avik Nori, Franco Marandi, Alireza Department of Applied Physics California Institute of Technology PasadenaCA91125 United States Department of Electrical Engineering California Institute of Technology PasadenaCA91125 United States Department of Electrical Engineering Stanford University StanfordCA94305 United States Department of Mechanical Engineering IPST University of Maryland College ParkMD20742 United States Theoretical Quantum Physics Laboratory RIKEN Cluster for Pioneering Research Saitama Wako351-0198 Japan RIKEN Center for Quantum Computing Saitama Wako351-0198 Japan Department of Physics University of Michigan Ann ArborMI48109-1040 United States

Mode-locked lasers play a key role in modern science and technology. Not only do they lay the foundation for ultrafast optics and play a central role in nonlinear optics, but also they have important applications in imaging1, metrology2, telecommunications3, sensing4, and computing5. While substantial efforts have focused on mode-locking the spectral modes of lasers6, relatively little attention has been paid to mode-locking their temporal modes. However, temporal mode-locking presents ample opportunities to develop new technologies7 and to study the intersection of nonlinear, non-Hermitian, and topological phenomena8, which, in recent years, has been a priority for the field of topological physics9-11. Here, we theoretically predict and experimentally realize topological temporal mode-locking in a laser cavity with time-delayed intracavity couplings. These couplings introduce non-Hermitian point-gap topology12 into the temporal modes of our laser and conspire with an effective nonlocal nonlinearity to generate mode-locked temporal structures in our laser cavity, whose form can be tailored by suitably engineering the underlying couplings. We harness this approach to realize a nonlinearity-driven non-Hermitian skin effect12, and we show that the topological temporal modes of our laser are robust against disorder-induced localization13. The flexibility and programmability of our topological temporal mode-locking scheme reveals new opportunities to study nonlinear9 and non-Hermitian10 topological phenomena in mode-locked photonic resonators and could enable new applications of mode-locked lasers to sensing and optical computing. Copyright © 2022, The Authors. All rights reserved.

关键词： Locks (fasteners)

来源：评论

学校读者我要写书评

暂无评论

quantum Simulation of the Bosonic Creutz Ladder with a Parametric Cavity

引用

Physical Review Letters 2021年第10期127卷 100503-100503页

作者： Jimmy S. C. Hung J. H. Busnaina C. W. Sandbo Chang A. M. Vadiraj I. Nsanzineza E. Solano H. Alaeian E. Rico C. M. Wilson Institute for Quantum Computing and Department of Electrical and Computer Engineering University of Waterloo Waterloo Ontario N2L 3G1 Canada Kipu Quantum Kurwenalstrasse 1 80804 Munich Germany International Center of Quantum Artificial Intelligence for Science and Technology (QuArtist) and Department of Physics Shanghai University 200444 Shanghai China Department of Physical Chemistry University of the Basque Country UPV/EHU Apartado 644 48080 Bilbao Spain IKERBASQUE Basque Foundation for Science Plaza Euskadi 5 48009 Bilbao Spain School of Electrical and Computer Engineering Department of Physics and Astronomy Quantum Science and Engineering Institute Purdue University West Lafayette Indiana 47907 USA

There has been a growing interest in realizing quantum simulators for physical systems where perturbative methods are ineffective. The scalability and flexibility of circuit quantum electrodynamics make it a promising platform for implementing various types of simulators, including lattice models of strongly coupled field theories. Here, we use a multimode superconducting parametric cavity as a hardware-efficient analog quantum simulator, realizing a lattice in synthetic dimensions with complex hopping interactions. The coupling graph, i.e., the realized model, can be programmed in situ. The complex-valued hopping interaction further allows us to simulate, for instance, gauge potentials and topological models. As a demonstration, we simulate a plaquette of the bosonic Creutz ladder. We characterize the lattice with scattering measurements, reconstructing the experimental Hamiltonian and observing important precursors of topological features including nonreciprocal transport and Aharonov-Bohm caging. This platform can be easily extended to larger lattices and different models involving other interactions.

关键词： quantum information with solid state qubits quantum simulation SQUID Lattice gauge theory

来源：评论

学校读者我要写书评

暂无评论

Generation of Schrödinger cat states with Wigner negativity using continuous-wave low-loss waveguide optical parametric amplifier

arXiv

引用

arXiv 2022年

作者： Takase, Kan Kawasaki, Akito Jeong, Byung K.Y.U. Endo, Mamoru Kashiwazaki, Takahiro Kazama, Takushi Enbutsu, Koji Watanabe, Kei Umeki, Takeshi Miki, Shigehito Terai, Hirotaka Yabuno, Masahiro China, Fumihiro Asavanant, Warit Yoshikawa, Jun-Ichi Furusawa, Akira Department of Applied Physics School of Engineering The University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo113-8656 Japan NTT Device Technology Labs NTT Corporation 3-1 Morinosato Wakamiya Kanagawa Atsugi243-0198 Japan Advanced ICT Research Institute National Institute of Information and Communications Technology 588-2 Iwaoka Nishi-ku Hyogo Kobe651-2492 Japan Graduate School of Engineering Kobe University 1-1 Rokkodai-cho Nada-ku Hyogo Kobe657-0013 Japan Optical Quantum Computing Research Team RIKEN Center for Quantum Computing 2-1 Hirosawa Saitama Wako351-0198 Japan

Continuous-wave (CW) squeezed light is used in generation of various optical quantum states thus is a fundamental resource of fault-tolerant universal quantum computation using optical continuous variables. To realize a practical quantum computer, a waveguide optical parametric amplifier (OPA) is an attractive CW squeezed light source in terms of its THz-order bandwidth and suitability for modularization. The usages of a waveguide OPA in quantum applications thus far, however, are limited due to the difficulty of the generation of the squeezed light with a high purity. In this paper, we report the first observation of Wigner negativity of the states generated by a heralding method using a waveguide OPA. We generate Schrödinger cat states at the wavelength of 1545 nm with Wigner negativity using a quasi-single-mode ZnO-doped periodically poled LiNbO3 waveguide module we developed. Wigner negativity is regarded as an important indicator of the usefulness of the quantum states as it is essential in the fault-tolerant universal quantum computation. Our result shows that our waveguide OPA can be used in wide range of quantum applications leading to a THz-clock optical quantum computer. © 2022, CC BY.

关键词： Optical parametric amplifiers

来源：评论

学校读者我要写书评

暂无评论

Emergent orbital skyrmion lattice in a triangular atom array

引用

Physical Review Research 2023年第4期5卷 L042042-L042042页

作者： Rui Cao Jinsen Han Jianmin Yuan Xiaopeng Li Yongqiang Li Department of Physics National University of Defense Technology Changsha 410073 People's Republic of China Department of Physics Graduate School of China Academy of Engineering Physics Beijing 100193 People's Republic of China State Key Laboratory of Surface Physics Key Laboratory of Micro and Nano Photonic Structures (MOE) and Department of Physics Fudan University Shanghai 200433 China Institute for Nanoelectronic Devices and Quantum Computing Fudan University Shanghai 200433 China Shanghai Qi Zhi Institute AI Tower Xuhui District Shanghai 200232 China Hunan Key Laboratory of Extreme Matter and Applications National University of Defense Technology Changsha 410073 China

Multiorbital optical lattices have been attracting rapidly growing research interest in the last several years, providing fascinating opportunities for orbital-based quantum simulations. Here, we consider bosonic atoms loaded in the degenerate p-orbital bands of a two-dimensional triangular optical lattice. This system is described by a multiorbital Bose-Hubbard model. We find the confined atoms in this system develop spontaneous orbital polarization, which forms a chiral Skyrmion lattice pattern in a large regime of the phase diagram. This is an orbital version of the skyrmion, reminiscent of those in spin systems. The emergence of the Skyrmion lattice is confirmed in both bosonic dynamical mean-field theory (BDMFT) and exact diagonalization (ED) calculations. By analyzing the quantum-tunneling-induced orbital-exchange interaction in the strong interaction limit, we find the Skyrmion lattice state arises due to the interplay of p-orbital symmetry and the geometric frustration of the triangular lattice. We provide experimental consequences of the orbital Skyrmion state that can be readily tested in cold atom experiments. Our study implies orbital-based quantum simulations could bring exotic scenarios unexpected from their spin analog.

关键词： Bose-Einstein condensates Cold gases in optical lattices Orbital order 2-dimensional systems Triangular lattice Ultracold gases Dynamical mean field theory Exact diagonalization

来源：评论

学校读者我要写书评

暂无评论

Creation of Magnetic Skyrmions in Two-Dimensional Van Der Waals Ferromagnets by Lattice Distortion

SSRN

引用

SSRN 2025年

作者： Zhang, Tingjia Yang, Chendi Lv, Xiaowei Zhao, Tuoyu Shi, Wu Li, Wei Liang, Jia Che, Renchao School of Materials and Chemistry University of Shanghai for Science and Technology Shanghai200093 China Laboratory of Advanced Materials Shanghai Key Lab of Molecular Catalysis and Innovative Materials Academy for Engineering and Technology Advanced Coatings Research Center of Ministry of Education of China Fudan University Shanghai200438 China State Key Laboratory of Surface Physics Institute for Nanoelectronic Devices and Quantum Computing Fudan University Shanghai200433 China Zhangjiang Fudan International Innovation Center Fudan University Shanghai201210 China Department of Physics Fudan University Shanghai200433 China Department of Materials Science State Key Laboratory of Photovoltaic Science and Technology Fudan University Shanghai200433 China

Two-dimensional (2D) van der Waals (vdW) ferromagnets provide an excellent platform for exploring exotic physical phenomena such as magnetic skyrmions and quantum topological phases. However, the centrosymmetric crystal structure inherent in these 2D vdW ferromagnets theoretically precludes the formation of magnetic skyrmions and topological phases. In this study, we investigate the origin of the absence of magnetic skyrmions in 2D vdW ferromagnets and propose an effective strategy to induce lattice distortion through doping, thereby enabling the formation of magnetic skyrmions. Specifically, we demonstrate that Co doping in Fe3GeTe2 leads to significant lattice distortion, transforming the original centrosymmetric crystal structure into a non-centrosymmetric one. This structural modification enables the emergence of a considerable Dzyaloshinskii-Moriya interaction (DMI), giving rise to Néel-type skyrmions. Additionally, the scalar spin chirality of these magnetic skyrmions acts as a virtual magnetic field, thereby inducing the topological Hall effect (THE) in Co-doped Fe3GeTe2. Our findings present a reliable method to manipulate spin textures and induce the THE in 2D vdW ferromagnets with non-zero DMI through lattice distortion, offering a promising route for the development of vdW ferromagnet-based spintronic devices. © 2025, The Authors. All rights reserved.

关键词： Van der Waals forces

来源：评论

学校读者我要写书评

暂无评论

Remote sensing of urbanization using machine learning and variational quantum regression

引用

AIP Conference Proceedings 2024年第1期2802卷

作者： G. Balamurugan Karthiganesh Durai S. Dhamotharan A. S. Aravintakshan Amal Salilan M. K. Aabid Assistant Professor Department of Computing Technologies Faculty of Engineering and Technology SRM Institute of Science and Technology Kattankulathur 603203 Chengalpattu Tamil Nadu India Chief Quantum Architect BosonQ Psi Bangalore India B.Tech Manakula Vinayagar Institute of Technology Pondicherry University Puducherry India

Urbanization plays an important role in the field of environmental science and for the growth of green society. Urbanization scaled up with the economical benefits in developing countries and in countries making sustainable development process on ecological paths with higher efficiency on the growth of the ecosystem. In civilization due to urbanization there are problems such as air excellence corrosion, limitations on the space for survival, issues in the health of urban. Towards the perspective advancement of urban ecology it is distorted from a speculative study in the field of interdisciplinary. This article provides a new idea using Machine Learning and quantum computing to produce an output where it gives an efficient building idea of integrating plants and trees with or around the building. The dataset are emission and absorption of carbon dioxide. In order to create the X_features, we either use approximation factors or real-time remote sensing. The main goal of the system is to train them with different machine learning models and show that if the data set time complexity increases exponentially, quantum Computers can be used to run the models.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Ultrabright Multiplexed Energy-Time-Entangled Photon Generation from Lithium Niobate on Insulator Chip

引用

Physical Review Applied 2021年第6期15卷 064059-064059页

作者： Guang-Tai Xue Yun-Fei Niu Xiaoyue Liu Jia-Chen Duan Wenjun Chen Ying Pan Kunpeng Jia Xiaohan Wang Hua-Ying Liu Yong Zhang Ping Xu Gang Zhao Xinlun Cai Yan-Xiao Gong Xiaopeng Hu Zhenda Xie Shining Zhu National Laboratory of Solid State Microstructures School of Physics School of Electronic Science and Engineering College of Engineering and Applied Sciences and Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing 210093 China State Key Laboratory of Optoelectronic Materials and Technologies and School of Physics and Engineering Sun Yat-sen University Guangzhou 510275 China Institute for Quantum Information and State Key Laboratory of High Performance Computing College of Computing National University of Defense Technology Changsha 410073 China

A high-flux entangled-photon source is a key resource for quantum optical study and application. Here, it is realized in a lithium niobate on isolator (LNOI) chip, with 2.79 × 1011 Hz/mW photon-pair rate and 1.53 × 109 Hz/(nm mW) spectral brightness. These data are boosted by over 2 orders of magnitude compared with existing technologies. A 160-nm-broad bandwidth is engineered for eight-channel multiplexed energy-time entanglement. Harnessed by high-extinction-frequency correlation and Franson interferences up to 99.17% visibility, such energy-time-entanglement multiplexing further enhances the high-flux data rate and warrants broad application in quantum-information processing on a chip.

关键词： Integrated optics Optical quantum information processing Optoelectronics Photon pairs & parametric down-conversion quantum state engineering Second order nonlinear optical processes Optical sources & detectors Waveguides

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：