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Maximal Quantum Interaction between Free Electrons and Photons

Physical Review Letters 2025年第4期134卷 043803-043803页

作者： Zetao Xie Zeling Chen Hao Li Qinghui Yan Hongsheng Chen Xiao Lin Ido Kaminer Owen D. Miller Yi Yang Department of Physics and HK Institute of Quantum Science and Technology The University of Hong Kong Pokfulam Hong Kong China Z. X. and Z. C. contributed equally to this Letter. Department of Applied Physics and Energy Sciences Institute Yale University New Haven Connecticut 06520 USA Interdisciplinary Center for Quantum Information State Key Laboratory of Modern Optical Instrumentation College of Information Science and Electronic Engineering Zhejiang University Hangzhou 310027 China Solid State Institute and Faculty of Electrical and Computer Engineering Technion—Israel Institute of Technology 32000 Haifa Israel

The emerging field of free-electron quantum optics enables electron-photon entanglement and holds the potential for generating nontrivial photon states for quantum information processing. Although recent experimental studies have entered the quantum regime, rapid theoretical developments predict that qualitatively unique phenomena only emerge beyond a certain interaction strength. It is thus pertinent to identify the maximal electron-photon interaction strength and the materials, geometries, and particle energies that enable one to approach it. We derive an upper limit to the quantum vacuum interaction strength between free electrons and single-mode photons, which illuminates the conditions for the strongest interaction. Crucially, we obtain an explicit energy selection recipe for electrons and photons to achieve maximal interaction at arbitrary separations and identify two optimal regimes favoring either fast or slow electrons over those with intermediate velocities. We validate the limit by analytical and numerical calculations on canonical geometries and provide near-optimal designs indicating the feasibility of strong quantum interactions. Our findings offer fundamental intuition for maximizing the quantum interaction between free electrons and photons and provide practical design rules for future experiments on electron-photon and electron-mediated photon-photon entanglement. They should also enable the evaluation of key metrics for applications such as the maximum power of free-electron radiation sources and the maximum acceleration gradient of dielectric laser accelerators.

关键词： Quantum optics

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The effect of Ni doping on the electronic structure and superconductivity in the noncentrosymmetric ThCoC2

arXiv

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arXiv 2021年

作者： Kuderowicz, Gabriel Wiendlocha, Bartlomiej Faculty of Physics and Applied Computer Science AGH University of Science and Technology Aleja Mickiewicza 30 Kraków30-059 Poland

ThCoC2 is a non-BCS, noncentrosymmetric superconductor with Tc ' 2.5 K, in which pairing mechanism was suggested to be either spin fluctuations or the electron-phonon coupling. Earlier experimental work revealed that Tc can be greatly enhanced upon Ni doping in ThCo1−xNixC2, up to 12 K for x = 0.4. In this work, using the Korringa-Kohn-Rostoker method with the coherent potential approximation (KKR-CPA), the evolution of the electronic structure upon Ni doping was studied and the increase of the density of states at the Fermi level was found. The electron-phonon coupling constant λ was calculated using the rigid muffin tin approximation (RMTA) and the increase in λ(x) was found. This indirectly confirms the electron-phonon coupling scenario as the trend in λ(x) is in qualitative agreement with the experiment when the electron-phonon pairing is assumed. Copyright © 2021, The Authors. All rights reserved.

关键词： Electron-phonon interactions

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Isolation and identification of xylanase producing thermophilic bacteria from compost piles and optimization of xylanase production

Journal of Biotech Research

引用

Journal of Biotech Research 2020年 11卷 122-132页

作者： Tsotetsi, Lerato Prenaven, Reddy Modise, Sekomeng Johannes Monapathi, Mzimkhulu Faculty of Applied and Computer Science Biotechnology Faculty of Applied and Computer Science Chemistry Vaal University of Technology Vanderbijlpark Park South Africa

Thermostable xylanases are produced by thermophilic microorganisms. Their stability at high temperatures enable their widespread applications in commercial processes that include feed, food, beverages, textile, pulp, and paper industries. Xylanases can be used to replace conventional chemical bleaching agents such as chlorine compounds that are not friendly to the environment. The aim of this study was to isolate thermophilic xylanase producing bacteria from compost piles, and to optimize for high xylanase production. The research process involved the isolation of thermophilic bacteria from compost piles, qualitative screening for xylanolytic activity, and quantitative production of crude xylanases using Solid State Fermentation. Subsequently, temperature and pH were optimized for maximum xylanase activity. Identification of xylanases producing bacteria was determined by microscopic, biochemical characteristics, and molecular techniques. Selection results revealed that 7 out of 8 isolates had xylanolytic activity. Two isolates, G1 and H1 produced high crude xylanases activities, 12.21 U/mL and 10.85 U/mL, respectively. Optimization studies showed higher xylanase activities for isolates G1 (21.43 U/mL) and H1 (22.4 U/mL). The bacterial isolates were identified as Bacillus pumilus and Bacillus safensis. Further studies should be directed towards thermostable microbial enzymes for their potential to improve the quality of industrial products and research. © 2020. All Rights Reserved.

关键词： Bacteria

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An Improved MangoNet Architecture Using Harris Hawks Optimization for Fruit Classification with Uncertainty Estimation

Journal of Uncertain Systems

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Journal of Uncertain Systems 2023年第1期16卷

作者： Rajalaxmi, R.R. Saradha, M. Fathima, S.K. Sathish Kumar, V.E. Sandeep Kumar, M. Prabhu, J. Department of Computer Science and Engineering Kongu Engineering College Perundurai Tamil Nadu Erode 638060 India Department of Mathematics School of Applied Sciences Reva University Karnataka Bengaluru 560064 India Department of Computer Science and Engineering Sona College of Technology Salem Tamil Nadu 636005 India Department of Industrial Engineering Hanyang University Seoul South Korea School of Information Technology and Engineering Vellore Institute of Technology Tamil Nadu Vellore 632014 India

Agriculture sector plays a crucial role in the development of the economic system for developing countries. Useful insights extracted from agricultural data would lead to a better economy in the upcoming future. It is hard to manually look for the ripened fruits for harvesting in a farmland of a big area. Automated image-based methods to identify the presence of fruits on a tree and determine the number of fruits present on the tree is a challenging problem. MangoNet architecture performs well in detecting the mangoes invariant. The proposed work improves the efficiency of the model by optimizing the dropout rate of the MangoNet architecture. Harris Hawks Swarm Optimization (HHO) algorithm is developed to tune the dropout rate of the model. The dropout rate is optimized using HHO in the architecture to avoid overfitting problem. The proposed method is compared with particle swarm optimization (PSO) and BAT algorithm (BA) which underestimate uncertainty. The simulation results exhibit improved accuracy over 80% when compared to other existing methods considered in this study. We show theoretically that this gives us the ability to capture uncertainty better than existing methods. © 2023 World Scientific Publishing Company.

关键词： Deep learning dropout rate Harris Hawks optimization hyperparameter MangoNet uncertainty estimation

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Preparing for HPC on RISC-V: Examining Vectorization and Distributed Performance of an Astrophysics Application with HPX and Kokkos

Preparing for HPC on RISC-V: Examining Vectorization and Dis...

引用

High Performance Computing, Networking, Storage and Analysis, SC-W: Workshops of the International Conference for

作者： Patrick Diehl Panagiotis Syskakis Gregor Daiß Steven R. Brandt Alireza Kheirkhahan Srinivas Yadav Singanaboina Dominic Marcello Chris Taylor John Leidel Hartmut Kaiser Applied Computer Science (CCS-7) Los Alamos National Laboratory Los Alamos NM U.S.A. Department of Physics and Astronomy Louisiana State University Baton Rouge LA U.S.A. LSU Center for Computation & Technology Louisiana State University Baton Rouge LA U.S.A. IPVS University of Stuttgart Stuttgart Germany Tactical Computing Labs Lindsay TX U.S.A. Department of Computer Science Louisiana State University Baton Rouge LA U.S.A.

ISBN: (数字)9798350355543

ISBN: (纸本)9798350355550

In recent years, interest in RISC-V computing architectures has moved from academic to mainstream, especially in the field of High Performance Computing where energy limitations are increasingly a concern. As of this year, the first single board RISC-V CPUs implementing the finalized ratified vector specification are being released. The RISC-V vector specification follows in the tradition of vector processors found in the CDC STAR-100, the Cray-1, the Convex C-Series, and the NEC SX machines and accelerators. The family of vector processors offers support for variable-length array processing as opposed to the fixed-length processing functionality offered by SIMD. Vector processors offer opportunities to perform vector-chaining which allows temporary results to be used without the need to resolve memory *** this work, we use the Octo-Tiger multi-physics, multi-scale, 3D adaptive mesh refinement astrophysics application to study these early RISC-V chips with vector machine support. We report on our experience in porting this modern C++ code (which is built upon several open-source libraries such as HPX and Kokkos) to RISC-V. In addition, we show the impact of the RISC-V Vector extension on a RISC-V single board computer by implementing the std :: experimental:simd interface and integrating it with our code. We also compare the application’s performance, scalability, and power consumption on desktop-grade RISC-V computer to an A64FX *** results presented in this paper are part of a longer-term evaluation of RISC-V’s viability for HPC applications.

关键词： Power demand Astrophysics High performance computing Europe computer architecture Hardware Vectors Supercomputers Libraries Vector processors

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A comprehensive overview of recommender system and sentiment analysis

arXiv

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arXiv 2021年

作者： AL-Ghuribi, Sumaia Mohammed Noah, Shahrul Azman Mohd Faculty of Information Science and Technology Universiti Kebangsaan Malaysia Malaysia Faculty of Applied Sciences Department of Computer Science Taiz University Yemen

Recommender system has been proven to be significantly crucial in many fields and is widely used by various domains. Most of the conventional recommender systems rely on the numeric rating given by a user to reflect his opinion about a consumed item;however, these ratings are not available in many domains. As a result, a new source of information represented by the user-generated reviews is incorporated in the recommendation process to compensate for the lack of these ratings. The reviews contain prosperous and numerous information related to the whole item or a specific feature that can be extracted using the sentiment analysis field. This paper gives a comprehensive overview to help researchers who aim to work with recommender system and sentiment analysis. It includes a background of the recommender system concept, including phases, approaches, and performance metrics used in recommender systems. Then, it discusses the sentiment analysis concept and highlights the main points in the sentiment analysis, including level, approaches, and focuses on aspect-based sentiment analysis. © 2021, CC BY.

关键词： Sentiment analysis

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Superconductivity in ternary Mg4Pd7As6

arXiv

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arXiv 2024年

作者： Świątek, Hanna Gutowska, Sylwia Winiarski, Michal J. Wiendlocha, Bartlomiej Klimczuk, Tomasz Faculty of Applied Physics and Mathematics Gdańsk University of Technology Narutowicza 11/12 Gdansk80-233 Poland Advanced Materials Center Gdańsk University of Technology Narutowicza 11/12 Gdansk80-233 Poland University of Vienna Faculty of Physics Computational Materials Physics Kolingasse 14-16 Vienna1090 Austria AGH University of Krakow Faculty of Physics and Applied Computer Science al. Mickiewicza 30 Krakow30-059 Poland

We report the synthesis and characterization of a new compound Mg4Pd7As6, which was found to be a superconductor with Tc = 5.45 K. Powder X-ray diffraction confirms the U4Re7Si6 structure (space group Im-3m, no. 229) with the lattice parameter a = 8.2572(1) Å. Magnetization, specific heat, and electrical resistivity measurements indicate that it is a moderate-coupling (λ = 0.72) type-II superconductor. The electronic and phonon structures are calculated, highlighting the importance of antibonding Pd-As interactions in determining the properties of this material. The calculated electron-phonon copling parameter λ = 0.76 agrees very well with the experimental finding, which confirms the conventional pairing mechanism in Mg4Pd7As6. © 2024, CC BY.

关键词： Lattice constants

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Nanoslot-Induced Ultrastrong Phonon-Photon and Phonon-Phonon Coupling in Hybrid Organic-Inorganic Perovskites 16

Nanoslot-Induced Ultrastrong Phonon-Photon and Phonon-Phonon...

引用

16th Pacific Rim Conference on Lasers and Electro-Optics, CLEO-PR 2024

作者： Kim, Dasom Hou, Jin Lee, Geon Agrawal, Ayush Kim, Sunghwan Zhang, Hao Bao, Di Baydin, Andrey Wu, Wenjing Tay, Fuyang Huang, Shengxi Hagenmüller, Daivd Chia, Elbert E. M. Kim, Dai-Sik Seo, Minah Mohite, Aditya D. Kono, Junichiro Applied Physics Graduate Program Smalley-Curl Institute Rice University HoustonTX77005 United States Department of Electrical and Computer Engineering Rice University HoustonTX77005 United States Department of Materials Science and NanoEngineering Rice University HoustonTX77005 United States Sensor System Research Center Korea Institute of Science and Technology Seoul02792 Korea Republic of Department of Physics and Astronomy Seoul National University Seoul08826 Korea Republic of Department of Chemical and Biomolecular Engineering Rice University HoustonTX77005 United States Ulsan44919 Korea Republic of Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University 637371 Singapore Smalley-Curl Institute Rice University HoustonTX77005 United States Université de Strasbourg Cnrs Strasbourg67000 France KU-KIST Graduate School of Converging Science and Technology Korea University Seoul02841 Korea Republic of Department of Physics and Astronomy Rice University HoustonTX77005 United States

Methods for harnessing vibrational states are desired for phonon-based technologies. We realized ultrastrong coupling of two phonon modes in perovskite materials induced by ultrastrong coupling with a common photonic ... 详细信息

ISBN: (纸本)9798350372076

关键词： Organic-inorganic materials

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Observation of the symmetry-protected signature of 3-body interactions

arXiv

引用

arXiv 2024年

作者： Zhukas, Liudmila A. Wang, Qingfeng Katz, Or Monroe, Christopher Marvian, Iman Duke Quantum Center Departments of Electrical and Computer Engineering and Physics Duke University DurhamNC27708 United States Chemical Physics Program Institute for Physical Science and Technology University of Maryland College ParkMD United States School of Applied and Engineering Physics Cornell University IthacaNY14853 United States

Identifying and characterizing multi-body interactions in quantum processes remains a significant challenge. This is partly because 2-body interactions can produce an arbitrary time evolution, a fundamental fact often called the universality of 2-local gates in the context of quantum computing. However, when an unknown Hamiltonian respects a U(1) symmetry such as charge or particle number conservation, N-body interactions exhibit a distinct symmetry-protected signature known as the N-body phase, which fewer-body interactions cannot mimic. We develop and demonstrate an efficient technique for the detection of 3-body interactions despite the presence of unknown 2-body interactions. This technique, which takes advantage of GHZ states for phase estimation, requires probing the unitary evolution and measuring its determinant in a small subspace that scales linearly with the system size, making it an efficient approach. Copyright © 2024, The Authors. All rights reserved.

关键词： Hamiltonians

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All-silicon quantum light source by embedding an artificial atom in a nanophotonic cavity

All-silicon quantum light source by embedding an artificial ...

引用

2023 Conference on Lasers and Electro-Optics, CLEO 2023

作者： Zhiyenbayev, Yertay Redjem, Walid Qarony, Wayesh Ivanov, Vsevolod Papapanos, Christos Liu, Wei Jhuria, Kaushalya Al Balushi, Zakaria Dhuey, Scott Schwartzberg, Adam Tan, Liang Z. Schenkel, Thomas Kante, Boubacar Department of Electrical Engineering and Computer Sciences University of California Berkeley BerkeleyCA94720 United States Accelerator Technology and Applied Physics Division Lawrence Berkeley National Laboratory BerkeleyCA94720 United States Department of Materials Science and Engineering University of California Berkeley BerkeleyCA94720 United States Materials Sciences Division Lawrence Berkeley National Laboratory BerkeleyCA94720 United States Molecular Foundry Lawrence Berkeley National Laboratory BerkeleyCA94720 United States

Quantum optics in silicon is promising. We report the first all-silicon quantum light source, with a single atomic center embedded in a nanophotonic cavity, resulting in enhanced light-matter interaction. © 2023 ... 详细信息

ISBN: (纸本)9781957171258

关键词： Silicon

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