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Feasibility study of a coherent feedback squeezer

Physical Review A 2020年第3期101卷 033802-033802页

作者： Shota Yokoyama Daniel Peace Warit Asavanant Takeyoshi Tajiri Ben Haylock Moji Ghadimi Mirko Lobino Elanor H. Huntington Hidehiro Yonezawa Centre for Quantum Computation and Communication Technology and School of Engineering and Information Technology The University of New South Wales Canberra ACT 2600 Australia Centre for Quantum Computation and Communication Technology and Centre for Quantum Dynamics Griffith University Brisbane QLD 4111 Australia Department of Applied Physics School of Engineering The University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo 113-8656 Japan School of Engineering and Information Technology The University of New South Wales Canberra ACT 2600 Australia Institute of Industrial Science The University of Tokyo 4-6-1 Komaba Meguro-ku Tokyo 153-8505 Japan Centre for Quantum Dynamics Griffith University Brisbane QLD 4111 Australia Queensland Micro and Nanotechnology Centre Griffith University Brisbane QLD 4111 Australia Centre for Quantum Computation and Communication Technology and Research School of Electrical Energy and Materials Engineering College of Engineering and Computer Science Australian National University Canberra ACT 2600 Australia

We investigate a coherent feedback squeezer that uses quantum coherent feedback (measurement-free) control. Our squeezer is simple, easy to implement, robust to the gain fluctuation, and broadband compared to the existing squeezers because of the negative coherent feedback configuration. We conduct a feasibility study that looks at the stability conditions for a feedback system to optimize the designs of real optical devices. The feasibility study gives fabrication tolerance necessary for designing and realizing the actual device. Our formalism for the stability analysis is not limited to optical systems but can be applied to the other bosonic systems.

关键词： Quantum feedback Quantum information processing with continuous variables Quantum optics

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A New Superhard Carbon Allotrope: T5-Carbon

SSRN

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SSRN 2020年

作者： Ding, Xian-Yong Zhang, Chao Wang, Dong-Qi Li, Bing-Sheng Wang, Qingping Yu, Zhi Gen Ang, Kah-Wee Zhang, Yong-Wei School of Materials Science and Engineering Anhui University of Science and Technology Huainan232001 China Multidisciplinary Initiative Center Institute of High Energy Physics Chinese Academy of Sciences Beijing100049 China State Key Laboratory for Environment-friendly Energy Materials Southwest University of Science and Technology MianyangSichuan621010 China Institute of High Performance Computing A*STAR Singapore138632 Singapore Department of Electrical and Computer Engineering National University of Singapore Singapore117583 Singapore

A novel carbon allotrope is predicted by first-principles calculations. This allotrope is obtained by replacing one of the two atoms in the primitive cell of diamond with a carbon tetrahedron, thus it contains five atoms in one primitive cell, termed T5-carbon. The stabilities of T5-carbon are checked in structural, thermal, vibrational and energy calculations. T5-carbon is a semiconductor with an indirect band gap of 3.18 eV, and has a lattice thermal conductivity of 409 W/mK. The Vickers hardness of T5-carbon is 76.5 GPa which is lower than that of diamond but larger than those of T-carbon and cubic boron nitride. © 2020, The Authors. All rights reserved.

关键词： III-V semiconductors

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Atomic-Level Regulation of Cobalt Single-Atom Nanozymes: engineering High-Efficiency Catalase Mimics

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Angewandte Chemie 2023年第19期135卷

作者： Dr. Yuanjun Chen Dr. Bing Jiang Prof. Haigang Hao Dr. Haijing Li Chenyue Qiu Xiao Liang Qingyun Qu Zedong Zhang Prof. Rui Gao Prof. Demin Duan Dr. Shufang Ji Prof. Dingsheng Wang Prof. Minmin Liang Department of Chemistry Tsinghua University Beijing 100084 China Department of Electrical and Computer Engineering University of Toronto Toronto Ontario M5S1A4 Canada Experimental Center of Advanced Materials School of Materials Science & Engineering Beijing Institute of Technology Beijing 100081 China College of Chemistry and Chemical Engineering Inner Mongolia University Hohhot 010021 China Beijing Synchrotron Radiation Facility Institute of High Energy Physics Chinese Academy of Sciences Beijing 100049 China Department of Materials Science and Engineering University of Toronto Toronto Ontario M5S3E4 Canada CAS Engineering Laboratory for Nanozyme Institute of Biophysics Chinese Academic of Science Beijing 100101 China Department of Chemistry University of Toronto Ontario M5S3H6 Canada

Nanozymes aim to mimic the highly evolved active centers of natural enzymes. Despite progress in nanozyme engineering, their catalytic performance is much less favorable compared with natural enzymes. This study shows that precise control over the atomic configuration of the active centers of Co single-atom nanozymes (SAzymes) enables the rational regulation of their catalase-like performance guided by theorical calculations. The constructed Co-N 3 PS SAzyme exhibits an excellent catalase-like activity and kinetics, exceeding the representative controls of Co-based SAzymes with different atomic configurations. Moreover, we developed an ordered structure-oriented coordination design strategy for rationally engineering SAzymes and established a correlation between the structure and enzyme-like performance. This work demonstrates that precise control over the active centers of SAzymes is an efficient strategy to mimic the highly evolved active sites of natural enzymes.

关键词： Atomic-Level Regulation Catalase Mimics Co Single-Atom Nanozymes

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SolarSLAM: Battery-free Loop Closure for Indoor Localisation

SolarSLAM: Battery-free Loop Closure for Indoor Localisation

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2020 IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS)

作者： Bo Wei Weitao Xu Chengwen Luo Guillaume Zoppi Dong Ma Sen Wang Northumbria University Newcastle upon Tyne United Kingdom City University of Hong Kong Hong Kong China College of Computer Science and Software Engineering Shenzhen University Shenzhen China Physics and Electrical Engineering Northumbria University Newcastle upon Tyne United Kingdom University of Cambridge Cambridge United Kingdom School of Engineering & Physical Sciences Heriot- Watt University Edinburgh United Kingdom

ISBN: (数字)9781728162126

ISBN: (纸本)9781728162133

In this paper, we propose SolarSLAM, a batteryfree loop closure method for indoor localisation. Inertial Measurement Unit (IMU) based indoor localisation method has been widely used due to its ubiquity in mobile devices, such as mobile phones, smartwatches and wearable bands. However, it suffers from the unavoidable long term drift. To mitigate the localisation error, many loop closure solutions have been proposed using sophisticated sensors, such as cameras, laser, etc. Despite achieving high-precision localisation performance, these sensors consume a huge amount of energy. Different from those solutions, the proposed SolarSLAM takes advantage of an energy harvesting solar cell as a sensor and achieves effective battery-free loop closure method. The proposed method suggests the key-point dynamic time warping for detecting loops and uses robust simultaneous localisation and mapping (SLAM) as the optimiser to remove falsely recognised loop closures. Extensive evaluations in the real environments have been conducted to demonstrate the advantageous photocurrent characteristics for indoor localisation and good localisation accuracy of the proposed method.

关键词： Performance evaluation Simultaneous localization and mapping Photovoltaic cells Sensor phenomena and characterization Mobile handsets Sensor systems Photoconductivity

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Terahertz excitonics in carbon nanotubes: exciton autoionization and multiplication

arXiv

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arXiv 2020年

作者： Bagsican, Filchito Renee G. Wais, Michael Komatsu, Natsumi Gao, Weilu Weber, Lincoln W. Serita, Kazunori Murakami, Hironaru Held, Karsten Hegmann, Frank A. Tonouchi, Masayoshi Kono, Junichiro Kawayama, Iwao Battiato, Marco Institute of Laser Engineering Osaka University Suita Osaka565-0871 Japan Institute for Solid State Physics TU Wien Vienna1040 Austria Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University Singapore Department of Electrical and Computer Engineering Rice University HoustonTX77005 United States Department of Physics Southern Illinois University Carbondale CarbondaleIL62901 United States Department of Physics University of Alberta EdmontonABT6G 2E1 Canada Department of Physics and Astronomy Rice University HoustonTX77005 United States Department of Material Science and NanoEngineering Rice University HoustonTX77005 United States Graduate School of Energy Science Kyoto University Kyoto606-8501 Japan

Excitons play major roles in optical processes in modern semiconductors, such as single-wall carbon nanotubes (SWCNTs),1–3 transition metal dichalcogenides,4–6 and 2D perovskite quantum wells.7,8 They possess extremely large binding energies (>100 meV), dominating absorption and emission spectra even at high temperatures.9,10 The large binding energies imply that they are stable, that is, hard to ionize, rendering them seemingly unsuited for optoelectronic devices that require mobile charge carriers, especially terahertz emitters and solar cells. Here, we have conducted terahertz emission and photocurrent studies on films of aligned single-chirality semiconducting SWCNTs11 and find that excitons autoionize, i.e., spontaneously dissociate into electrons and holes. This process naturally occurs ultrafast ( Copyright © 2020, The Authors. All rights reserved.

关键词： Excitons

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Robust Multiplexing with Topolectrical Higher-Order Chern Insulators

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Physical Review Applied 2020年第6期13卷 064031-064031页

作者： Xiang Ni Zhicheng Xiao Alexander B. Khanikaev Andrea Alù Photonics Initiative Advanced Science Research Center City University of New York New York New York 10031 USA Physics Program Graduate Center of the City University of New York New York New York 10016 USA Department of Electrical and Computer Engineering University of Texas at Austin Austin Texas 78703 USA Department of Electrical Engineering Grove School of Engineering City College of the City University of New York 140th Street and Convent Avenue New York New York 10031 USA

We explore an implementation of a higher-order Chern insulator in a topolectrical circuit as a platform to implement robust signal multiplexing. By utilizing basic circuit layouts that realize the required complex hopping between neighboring lattice sites, we demonstrate different topological phases in a three-dimensional topolectrical circuit, including a Wannier-based Chern insulator and a crystalline topological phase. The topological chiral hinge states supported by the circuit are nonreciprocal and avoid propagation to the hinge opposite the excitation. Such an unusual response can be explained in terms of a synthetic gauge field of the circuit lattice, enabling multiplexing inherently robust to defects.

关键词： Chern insulators Edge states Metamaterials Devices Topological materials PT-symmetry

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Certification of spin-based quantum simulators

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Physical Review A 2020年第5期101卷 052344-052344页

作者： Abolfazl Bayat Benoit Voisin Gilles Buchs Joe Salfi Sven Rogge Sougato Bose Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of China Chengdu 610051 China Department of Physics and Astronomy University College London London WC1E 6BT United Kingdom Centre for Quantum Computation and Communication Technology School of Physics The University of New South Wales Sydney New South Wales 2052 Australia Department of Electrical and Computer Engineering University of British Columbia Vancouver BC V6T 1Z4 Canada

Quantum simulators are engineered devices controllably designed to emulate complex and classically intractable quantum systems. A key challenge is to certify whether the simulator truly mimics the Hamiltonian of interest. This certification step requires the comparison of a simulator's output to a known answer, which is usually limited to small systems due to the exponential scaling of the Hilbert space. Here, in the context of Fermi-Hubbard spin-based analog simulators, we propose a modular many-body spin to charge conversion scheme that scales linearly with both the system size and the number of low-energy eigenstates to discriminate. Our protocol is based on the global charge state measurement of a 1D spin chain performed at different detuning potentials along the chain. In the context of semiconductor-based systems, we identify realistic conditions for detuning the chain adiabatically to avoid state mixing while preserving charge coherence. Large simulators with vanishing energy gaps, including 2D arrays, can be certified block-by-block with a number of measurements scaling only linearly with the system size.

关键词： Charge Coulomb blockade Quantum simulation Spin blockade 1-dimensional spin chains Doped semiconductors Quantum dots Strongly correlated systems First-principles calculations Heisenberg model Hubbard model Many-body techniques

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Causal feature selection method based on extended Markov blanket

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International Journal of Wireless and Mobile Computing 2018年第4期15卷 310-317页

作者： Hong, Yinghan Hao, Zhifeng Mai, Guizhen Huang, Han School of Computer Science and Technology Guangdong University of Technology Guangzhou510006 China School of Physics and Electronic Engineering Hanshan Normal University Chaozhou521041 China School of Mathematics and Big Data Foshan University Foshan528000 China School of Software Engineering South China University of Technology Guangzhou510006 China

Feature selection is generally a key pre-process in artificial intelligence, machine learning and pattern recognition. Its purpose is to select a set of features that is most effective to predict the target. The existing features selection methods are generally a kind of features sorting methods according to the dependence between these features and the target variable. It is difficult for these methods to determine a certain number of features;moreover, in this study we show that some key feature is probably removed by these methods. To alleviate this problem, a causal feature selection method based on causal network is proposed. When the target variable and its candidate feature set form a causal network model, the proposed method can detect the causal features by conditional independence test based method according to extended Markov blanket. This method is able to cut out a certain number of features, and simultaneously can avoid missing any key feature. Experimental results demonstrate that the proposal outperforms the counterparts when applied to support vector regression. Copyright © 2018 Inderscience Enterprises Ltd.

关键词： Feature Selection

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Quantum Simulation for High Energy physics

arXiv

引用

arXiv 2022年

作者： Bauer, Christian W. Davoudi, Zohreh Balantekin, A. Baha Bhattacharya, Tanmoy Carena, Marcela de Jong, Wibe A. Draper, Patrick El-Khadra, Aida Gemelke, Nate Hanada, Masanori Kharzeev, Dmitri Lamm, Henry Li, Ying-Ying Liu, Junyu Lukin, Mikhail Meurice, Yannick Monroe, Christopher Nachman, Benjamin Pagano, Guido Preskill, John Rinaldi, Enrico Roggero, Alessandro Santiago, David I. Savage, Martin J. Siddiqi, Irfan Siopsis, George Van Zanten, David Wiebe, Nathan Yamauchi, Yukari Yeter-Aydeniz, Kübra Zorzetti, Silvia Physics Division Lawrence Berkeley National Laboratory BerkeleyCA94720 United States Department of Physics Maryland Center for Fundamental Physics University of Maryland College ParkMD20742 United States Department of Physics University of Wisconsin MadisonWI53706 United States T-2 Los Alamos National Laboratory Los AlamosNM87545 United States Fermi National Accelerator Laboratory BataviaIL60510 United States Enrico Fermi Institute University of Chicago ChicagoIL60637 United States Kavli Institute for Cosmological Physics University of Chicago ChicagoIL60637 United States Department of Physics University of Chicago ChicagoIL60637 United States Department of Physics Illinois Center for the Advanced Study of the Universe and Illinois Quantum Information Science and Technology Center University of Illinois UrbanaIL61801 United States QuEra Computing Inc BostonMA02135 United States Department of Mathematics University of Surrey Guildford Surrey GU2 7XH United Kingdom Center for Nuclear Theory Department of Physics and Astronomy Stony Brook University NY11794-3800 United States Department of Physics Brookhaven National Laboratory UptonNY11973 United States Pritzker School of Molecular Engineering Chicago Quantum Exchange Kadanoff Center for Theoretical Physics University of Chicago IL60637 United States QBraid Co. Harper Court 5235 ChicagoIL60615 United States Department of Physics Harvard University CambridgeMA02138 United States Department of Physics and Astronomy University of Iowa Iowa CityIA52242 United States Duke Quantum Center Duke University DurhamNC27701 United States Department of Electrical and Computer Engineering Duke University DurhamNC27708 United States Department of Physics Duke University DurhamNC27708 United States IonQ Inc. College ParkMD20740 United States Physics and Astronomy Department Rice University HoustonTX77005 United States Institute for Quantum Information and Matter Californi

It is for the first time that quantum simulation for High Energy physics (HEP) is studied in the U.S. decadal particle-physics community planning, and in fact until recently, this was not considered a mainstream topic in the community. This fact speaks of a remarkable rate of growth of this subfield over the past few years, stimulated by the impressive advancements in Quantum Information sciences (QIS) and associated technologies over the past decade, and the significant investment in this area by the government and private sectors in the U.S. and other countries. High-energy physicists have quickly identified problems of importance to our understanding of nature at the most fundamental level, from tiniest distances to cosmological extents, that are intractable with classical computers but may benefit from quantum advantage. They have initiated, and continue to carry out, a vigorous program in theory, algorithm, and hardware co-design for simulations of relevance to the HEP mission. This community whitepaper is an attempt to bring this exciting and yet challenging area of research to the spotlight, and to elaborate on what the promises, requirements, challenges, and potential solutions are over the next decade and beyond. © 2022, CC BY.

关键词： High energy physics

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Tunable and enhanced Rashba spin-orbit coupling in iridate-manganite heterostructures

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Physical Review B 2020年第12期102卷 125145-125145页

作者： T. S. Suraj Ganesh Ji Omar Hariom Jani M. M. Juvaid Sonu Hooda Anindita Chaudhuri Andrivo Rusydi K. Sethupathi Thirumalai Venkatesan Ariando Ariando M. S. Ramachandra Rao Department of Physics Nano Functional Materials Technology Center Material Science Research Center Indian Institute of Technology Madras Chennai 600036 India Low Temperature Physics Lab Department of Physics Indian Institute of Technology Madras Chennai 600036 India Department of Physics National University of Singapore Singapore 117542 Singapore NUSNNI-NanoCore National University of Singapore Singapore 117411 Singapore National University of Singapore Graduate School for Integrative Sciences and Engineering (NGS) University Hall 21 Lower Kent Ridge Road Singapore 119077 Singapore Singapore Synchrotron Light Source National University of Singapore 5 Research Link Singapore 117603 Singapore Department of Electrical and Computer Engineering National University of Singapore Singapore 117576 Singapore

Tailoring spin-orbit interactions and Coulomb repulsion are the key features to observe exotic physical phenomena such as magnetic anisotropy and topological spin texture at oxide interfaces. Our study proposes a platform for engineering magnetism and spin-orbit coupling at the LaMnO3/SrIrO3 (3d−5d) oxide interface by tuning the LaMnO3 growth conditions, which controls the lattice displacement and spin-correlated interfacial coupling through charge transfer. We report a tunable and enhanced interface-induced Rashba spin-orbit coupling where the spin relaxation mechanism varies with magnetic behavior of the underlying LaMnO3 layer. The x-ray spectroscopy measurements reveal the quantitative valence states of Mn and their impact on charge transfer. Our angle-dependent magnetoresistance measurements also reflects the signature of magnetic proximity effect in SrIrO3 and can be tuned with the magnetic nature of LaMnO3 in a LaMnO3/SrIrO3 bilayer. Our work demonstrates a route to engineer the interface-induced Rashba spin-orbit coupling and magnetic proximity effect at the 3d−5d oxide interface for spintronics applications.

关键词： Magnetoresistance Rashba coupling Spin relaxation Spin-orbit coupling Interfaces Strongly correlated systems

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