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Compact source for quadripartite deterministically entangled optical fields

Fundamental Research 2025年第1期5卷 132-137页

作者： Yanhong Liu Yaoyao Zhou Liang Wu Jiliang Qin Zhihui Yan Xiaojun Jia Department of Physics Taiyuan Normal UniversityJinzhong 030619China Institute of Computational and Applied Physics Taiyuan Normal UniversityJinzhong 030619China State Key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Opto-ElectronicsShanxi UniversityTaiyuan 030006China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China College of Information Engineering Shanxi Vocational University of Engineering Science and TechnologyJinzhong 030619China

Since entangled multiple optical fields were identified as the building blocks of quantum networks,the quadripartite entangled optical fields have been produced by using four degenerate optical parametric amplifiers or two nondegenerate optical parametric amplifiers(NOPAs).However,realizing an efficient and compact source for multiple quantum users has remained an outstanding challenge,hindering their practical ***,we proposed a compact and feasible scheme to deterministically entangle four spatially separated optical fields,employing only a single ***,two-sided output NOPA-based optical fields were coupled on a beam splitter network to form the quadripartite entangled state,causing the deterministic generation of both the Greenberger–Horne–Zeilinger(GHZ)and the linear cluster states in this compact entanglement *** also obtained the optimal experimental parameters based on the simulation results,thereby providing a direct reference for experimental *** findings propose that the resultant GHZ and linear cluster states can be potentially applied in quantum-enhanced information science,specifically in quantum secret sharing,controlled quantum teleportation networks,and quantum-entangled atomic ensemble networks.

关键词： Quadripartite entanglement Single NOPA Compact source GHZ state Cluster state

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An Extendable Cloud-Native Alloy Property Explorer

arXiv

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arXiv 2024年

作者： Li, Zhuoyuan Wen, Tongqi Zhang, Yuzhi Liu, Xinzijian Zhang, Chengqian Pattamatta, A.S.L. Subrahmanyam Gong, Xiaoguo Ye, Beilin Wang, Han Zhang, Linfeng Srolovitz, David J. Department of Mechanical Engineering The University of Hong Kong Hong Kong AI for Science Institute Beijing China DP Technology Beijing China Laboratory of Computational Physics Institute of Applied Physics and Computational Mathematics Beijing China

The ability to rapidly evaluate materials properties through atomistic simulation approaches is the foundation of many new artificial intelligence-based approaches to materials identification and design. This depends on the availability of accurate descriptions of atomic bonding through various forms of interatomic potentials. We present an efficient, robust platform for calculating materials properties, i.e., APEX, the Alloy Property Explorer. APEX enables the rapid evolution of interatomic potential development and optimization, which is of particular importance in fine-tuning new classes of general AI-based foundation models to forms that are readily applicable to impacting materials development. APEX is an open-source, extendable, and cloud-native platform for material property calculations using a range of atomistic simulation methodologies that effectively manages diverse computational resources and is built upon user-friendly features including automatic results visualization, web-based platforms and NoSQL database client. It is designed for expert and non-specialist users, lowers the barrier to entry for interdisciplinary research within the "AI for Materials" framework. We describe the foundation and use of APEX, as well as provide an example of its application to properties of titanium for a wide-range of bonding descriptions. Copyright © 2024, The Authors. All rights reserved.

关键词： Materials properties

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Tracing Ion Migration in Halide Perovskites with Machine Learned Force Fields

arXiv

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arXiv 2024年

作者： Tyagi, Viren Pols, Mike Brocks, Geert Tao, Shuxia Materials Simulation & Modelling Department of Applied Physics and Science Education Eindhoven University of Technology Eindhoven5600 MB Netherlands Center for Computational Energy Research Department of Applied Physics and Science Education Eindhoven University of Technology Eindhoven5600 MB Netherlands Computational Chemical Physics Faculty of Science and Technology MESA+ Institute for Nanotechnology University of Twente Enschede7500 AE Netherlands

Halide perovskite optoelectronic devices suffer from chemical degradation and currentvoltage hysteresis induced by migration of highly mobile charged defects. Atomic scale molecular dynamics simulations can capture the motion of these ionic defects, but classical force fields are too inflexible to describe their dynamical charge states. Using CsPbI3 as a case study, we develop machine learned force fields from density functional theory calculations and study the diffusion of charged halide interstitial and vacancy defects in bulk CsPbI3. We find that negative iodide interstitials and positive iodide vacancies, the most stable charge states for their respective defect type, migrate at similar rates at room temperature. Neutral interstitials are faster, but neutral vacancies are one order of magnitude slower. Oppositely charged interstitials and vacancies, as they can occur in device operation or reverse bias conditions, are significantly slower and can be considered relatively immobile. © 2024, CC BY.

关键词： Perovskite

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Advancing Carriers Mobility in MnSb2Te4 Thermoelectrics via Tailored Textures and Vacancy Modification

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Advanced Energy Materials 2025年第0期

作者： Xu, Xiao Mao, Dasha Liedke, Maciej Oskar Butterling, Maik Cui, Juan Wang, Jinghan Luo, Yiyuan Ge, Zhenhua Hirschmann, Eric Wagner, Andreas He, Jiaqing Nielsch, Kornelius He, Ran Institute for Metallic Materials Leibniz Institute for Solid State and Materials Research Dresden01069 Germany Department of Physics Southern University of Science and Technology Shenzhen518055 China Institute of Radiation Physics Helmholtz-Zentrum Dresden-Rossendorf Dresden01328 Germany Laboratory of Computational Physics Institute of Applied Physics and Computational Mathematics Beijing100088 China Faculty of Materials Science and Engineering Kunming University of Science and Technology Kunming650093 China

Enhancing carrier mobility plays a crucial role in significantly improving thermoelectric performance. However, due to the lack of a systematic strategy, achieving high mobility remains an elusive goal for most compounds. In this study, the hot-forging method is applied to polycrystalline MnSb₂Te₄, achieving a remarkable 300% improvement in carrier mobility. Through electron backscattering diffraction microstructural analysis, it is demonstrated how optimizing textures can accelerate carrier movement in MnSb₂Te₄ bulk materials. Moreover, theoretical calculations, combined with experimental positron annihilation spectroscopy, reveal that Te vacancies help counteract intrinsic cation defects, leading to a simultaneous increase in carrier mobility. As a result, the hot-forged MnSb₂Te₄ specimen, with a diameter of 15 mm, reaches a record-high maximum figure of merit (ZT) value of 1.3 at 773 K and an impressive average ZT of 0.7 between 323 and 773 K. The experimental output efficiency of 4.6%, observed at 773 K on the MnSb₂Te₄-based single-leg module, further confirms that the improved transport properties are due to the enhanced carrier mobility. This comprehensive study offers valuable insights into mobility enhancement in MnSb₂Te₄ and provides a promising direction for exploring similar improvements in other thermoelectric materials. © 2025 The Author(s). Advanced Energy Materials published by Wiley-VCH GmbH.

关键词： Positron annihilation

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Brominated PEAI as Multi-Functional Passivator for High-Efficiency Perovskite Solar Cell

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Energy & Environmental Materials 2023年第3期6卷 50-57页

作者： Minghao Li Junjie Zhou Liguo Tan Yue Liu Siyang Wang Chaofan Jiang Hang Li Xing Zhao Xingyu Gao Wolfgang Tress Liming Ding Chenyi Yi State Key Laboratory of Power System Department of Electrical EngineeringTsinghua UniversityBeijing 100084China Shanghai Synchrotron Radiation Facility(SSRF) Shanghai Advanced Research InstituteChinese Academy of ScienceShanghai 201800China Institute of Computational Physics Zurich University of Applied SciencesWinterthur 8401Switzerland Center of Excellence in Nanoscience(CAS) Key Laboratory of Nanosystem and Hierarchical Fabrication(CAS)National Center for Nanoscience and TechnologyBeijing 100190China

The interfaces of perovskite solar cells(PSCs)are well known to be rich in deep-level carrier traps,which serve as non-radiative recombination centers and limit the open-circuit voltage(Voc)and power conversion efficiency(PCE)of *** chemistry and surface passivators have been researched extensively and mainly focused on the neutralization of uncoordinated lead or anion ***,a novel brominated passivator 2-bromophenethylammonium iodide(2-Br-PEAI)is introduced for a multi-functional passivation effect at the perovskite *** brominated species readily form 2D perovskite on top of the 3D perovskite and multi-interact with the 3D perovskite *** from the halide vacancy filling and anion bonding ability,the Br atoms on the benzene ring can interact with the FA cations via strong hydrogen bonding N-H…Br and interact with the[PbI_(6)]^(4−)inorganic *** interface defects in the PSCs are well passivated,minimizing non-radiative recombination and enhancing device *** a result,a champion PCE of 24.22%was achieved with high V_(oc)and fill *** addition,modified devices also showed enhanced operational stability(retention of>95%initial PCE after 400 h)and humidity resistance(>90%initial PCE maintained after 1500 h under~50%RH).

关键词： brominated PEAI high efficiency perovskite solar cell surface passivation

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Enhanced thermoelectric properties of two-dimensional Janus ferromagnetic LaBrI with strain-induced valley degeneracy

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Physical Review B 2025年第15期111卷 155433-155433页

作者： Anuja Kumari Raman D. K. Tanu Choudhary Raju K. Biswas Abhinav Nag Santanu K. Maiti Jagdish Kumar Physics and Applied Mathematics Unit Indian Statistical Institute 203 Barrackpore Trunk Road Kolkata- 700 108 India Department of Computational Sciences Central University of Punjab Bathinda-151 401 India Department of Physics M S Ramaiah University of Applied Sciences Bengaluru-560 058 India Department of Physics North Eastern Regional Institute of Science and Technology Nirjuli Arunachal Pradesh-791 109 India Department of Physics GGDSD College Rajpur Palampur-176 061 India

Since the successful synthesis of the MoSSe monolayer, which violated the out-of-plane mirror symmetry of transition metal dichalcogenide monolayers, considerable and systematic research has been conducted on Janus monolayer materials. By systematically analyzing the LaBrI monolayer, we are able to learn more about the novel Janus material by focusing on the halogen family next to group VIA (S, Se, Te). The structural optimizations have been carried out using pseudopotential-based Quantum Espresso code. Computed structural parameters are in good agreement with literature reports. The optimized crystal structures are used for computing the effect of strain on electronic and thermoelectric properties. Dynamical stability predicts that this material can withstand up to 10% of tensile strain. Computed electronic structure reveals material to be indirect wide band-gap ferromagnet with magnetic moment 1 µB. With increase in the biaxial tensile strain the band gap decreases. Furthermore, the computed magnetothermoelectric properties predict high Seebeck coefficient ∼400 µV/K and low thermal conductivity of ∼0.93 W/m K in LaBrI, which results in a high ZT∼1.84 for 4% strain at 800 K. The present study supports the fact that tensile strain on ferromagnetic LaBrI material can further enhance TE properties, making it a promising material for TE applications at higher temperatures.

关键词： Tensile strain

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Resolution-enhanced X-ray fluorescence microscopy via deep residual networks

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npj computational Materials 2023年第1期9卷 1935-1942页

作者： Longlong Wu Seongmin Bak Youngho Shin Yong S.Chu Shinjae Yoo Ian K.Robinson Xiaojing Huang Computational Science Initiative Brookhaven National LaboratoryUptonNY 11973USA Condensed Matter Physics and Materials Science Department Brookhaven National LaboratoryUptonNY 11973USA National Synchrotron Light Source II Brookhaven National LaboratoryUptonNY 11973USA Materials Engineering Research Facility Applied Materials DivisionArgonne National LaboratoryLemontIL 60439USA London Centre for Nanotechnology University College LondonLondon WC1E 6BTUK

Multimodal hard X-ray scanning probe microscopy has been extensively used to study functional materials providing multiple contrast *** instance,combining ptychography with X-ray fluorescence(XRF)microscopy reveals structural and chemical properties *** ptychography can achieve diffraction-limited spatial resolution,the resolution of XRF is limited by the X-ray probe ***,we develop a machine learning(ML)model to overcome this problem by decoupling the impact of the X-ray probe from the XRF *** enhanced spatial resolution was observed for both simulated and experimental XRF data,showing superior performance over the state-of-the-art scanning XRF method with different nano-sized X-ray *** spatial resolutions were also observed for the accompanying XRF tomography *** this probe profile deconvolution with the proposed ML solution to enhance the spatial resolution of XRF microscopy will be broadly applicable across both functional materials and biological imaging with XRF and other related application areas.

关键词： resolution overcome instance

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Electron charge qubit with 0.1 millisecond coherence time

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Nature physics 2024年第1期20卷 116-122页

作者： Zhou, Xianjing Li, Xinhao Chen, Qianfan Koolstra, Gerwin Yang, Ge Dizdar, Brennan Huang, Yizhong Wang, Christopher S. Han, Xu Zhang, Xufeng Schuster, David I. Jin, Dafei Center for Nanoscale Materials Argonne National Laboratory LemontIL United States Pritzker School of Molecular Engineering University of Chicago ChicagoIL United States Computational Research Division Lawrence Berkeley National Laboratory BerkeleyCA United States The NSF AI Institute for Artificial Intelligence and Fundamental Interactions CambridgeMA United States Computer Science and Artificial Intelligence Laboratory Massachusetts Institute of Technology CambridgeMA United States James Franck Institute and Department of Physics University of Chicago ChicagoIL United States Department of Electrical and Computer Engineering Northeastern University BostonMA United States Department of Applied Physics Stanford University StanfordCA United States Department of Physics and Astronomy University of Notre Dame Notre DameIN United States

Electron charge qubits are compelling candidates for solid-state quantum computing because of their inherent simplicity in qubit design, fabrication, control and readout. However, electron charge qubits built on conventional semiconductors and superconductors suffer from severe charge noise that limits their coherence time to the order of one microsecond. Here we report electron charge qubits that exceed this limit, based on isolated single electrons trapped on an ultraclean solid neon surface in a vacuum. Quantum information is encoded in the motional states of an electron that is strongly coupled with microwave photons in an on-chip superconducting resonator. The measured relaxation and coherence times are both on the order of 0.1 ms, surpassing all existing charge qubits and rivalling state-of-the-art superconducting transmon qubits. The simultaneous strong coupling of two qubits with a common resonator is also demonstrated, as the first step towards two-qubit entangling gates for universal quantum computing. © 2023, The Author(s), under exclusive licence to Springer Nature Limited.

关键词： Superconducting resonators

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Phonon Polariton Dispersion in Metal-Doped Nanocomposite Superlattice System

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Journal of Optical Communications 2023年第2期44卷 237-242页

作者： Krishnamurthy, R. Revathy, V. Wilson, K. S. Joseph Taya, Sofyan A. Amiri, I.S. Department of Electronics and Communication Engineering Sri Vasavi Engineering College Andhra Pradesh Tadepalligudem India Department of Physics Sethu Institute of Technology Tamilnadu Kariapatti India Karumathur Tamilnadu Madurai625 514 India Physics Department Islamic University of Gaza Gaza Palestine Computational Optics Research Group Advanced Institute of Materials Science Ton Duc Thang University Ho Chi Minh City Viet Nam Faculty of Applied Sciences Ton Duc Thang University Ho Chi Minh City Viet Nam

Copper nanoparticles (Cu) anchored lithium niobate (LiNbO3) nanostructures were prepared by a simple hydrothermal technique. The fine and sparse Cu nanoparticles were homogeneously dispersed over the surface of LiNbO3. An effectual anchoring of Cu was evidenced from the acquired reflection planes in diffraction analysis, which clearly indicate the face-centered cubic structure of Cu. The UV-Visible spectrum of LiNbO3 and Cu/LiNbO3 nanocomposites were also studied. When the Cu nanoparticles were doped with LiNbO3/LiTaO3 superlattice system, the change in the dispersion relation was observed theoretically. The characteristics of the polariton dispersion variation with filling factor of Cu nanoparticles concentration were investigated systematically. The importance of the polariton modes in communication sector was analyzed and the occurrence of new modes on the polaritonic gap, where the propagation of the electromagnetic wave is forbidden, were obtained in the system due to the presence of copper nanoparticles. © 2019 Walter de Gruyter GmbH, Berlin/Boston.

关键词： Polariton

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Molecular Opacity Calculations for Lithium Hydride at Low Temperature

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Chinese physics Letters 2020年第12期37卷 24-30页

作者： Gui-Ying Liang Yi-Geng Peng Rui Li Yong Wu Jian-Guo Wang Institute of Applied Physics and Computational Mathematics Beijing 100088China Department of Applied Physics Nanjing University of Science and TechnologyNanjing 210094China Department of Physics College of ScienceQiqihar UniversityQiqihar 161006China HEDPS Center for Applied Physics and TechnologyPeking UniversityBeijing 100084China

The opacities of the lithium hydride molecule are calculated for temperatures of 300 K,1000 K,1500 K,and 2000 K,at a pressure of 10 atm,in which the contributions from the five low-lying electronic states are *** ab initio multi-reference single and double excitation configuration interaction(MRDCI)method is applied to compute the potential energy curves(PECs)of the 7 LiH,including four 1∑+states and one 1Πstate,as well as the corresponding transition dipole moments between these *** ro-vibrational energy levels are calculated based on the PECs obtained,together with the spectroscopic *** addition,the partition functions are also computed,and are provided at temperatures ranging from 10 K to 2000 K for 7 LiH,7 LiD,6 LiH,and 6 LiD.

关键词： Lithium hydride partition

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