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Fast generation of high-fidelity mechanical non-Gaussian states via additional amplifier and photon subtraction

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Physical Review Research 2023年第3期5卷 L032031-L032031页

作者： Dong-Long Hu Jia-Jin Zou Feng-Xiao Sun Jie-Qiao Liao Qiongyi He Ze-Liang Xiang School of Physics Sun Yat-sen University Guangzhou 510275 China State Key Laboratory for Mesoscopic Physics School of Physics Frontiers Science Center for Nano-Optoelectronics and Collaborative Innovation Center of Quantum Matter Peking University Beijing 100871 China Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education Key Laboratory for Matter Microstructure and Function of Hunan Province Department of Physics and Synergetic Innovation Center for Quantum Effects and Applications Hunan Normal University Changsha 410081 China

Non-Gaussian states (NGSs) with higher-order correlation properties have wide-range applications in quantum information processing. However, the generation of such states with high quality still faces practical challenges. Here, we propose a protocol to faithfully generate two types of mechanical NGSs, i.e., Schrödinger cat states and Fock states, in open optomechanical systems, even when the cooperativity is smaller than one (g2/κγ<1). In contrast to the usual scheme, a short squeezed field is pumped to rapidly entangle with a mechanical resonator via a beam-splitter-like optomechanical interaction, effectively reducing the mechanical decoherence. Furthermore, by performing an additional amplifier and a following multiphoton subtraction on the entangled optical field, one can selectively obtain the high-fidelity mechanical cat and Fock states. This protocol is robust to various imperfections, allowing it to be implemented with state-of-the-art experimental systems with close to unit fidelity. Moreover, it can be extended to generate a four-component cat state and provide possibilities for future quantum applications of NGSs.

关键词： Optomechanics Quantum entanglement Quantum information processing Quantum optics Optical microcavities

Generalized ultrastrong optomechanical-like coupling

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Physical Review A 2020年第6期101卷 063802-063802页

作者： Jie-Qiao Liao Jin-Feng Huang Lin Tian Le-Man Kuang Chang-Pu Sun Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education Key Laboratory for Matter Microstructure and Function of Hunan Province Department of Physics and Synergetic Innovation Center for Quantum Effects and Applications Hunan Normal University Changsha 410081 China School of Natural Sciences University of California Merced California 95343 USA Beijing Computational Science Research Center Beijing 100193 China Graduate School of Chinese Academy of Engineering Physics Beijing 100084 China

Ultrastrong optomechanical interaction is a significant element for the study of the fundamentals and applications of optomechanical physics, but its realization remains a big challenge in the field of optomechanics. In this work, we propose a reliable scheme to realize a generalized ultrastrong optomechanical-like coupling in a cross-Kerr-type coupled two-bosonic-mode system, in which one of the two bosonic modes is strongly driven. The generalized optomechanical-like interaction takes the form of a product of the excitation number operator of one mode and the rotated quadrature operator of the other mode. Here, both the coupling strength and the phase angle of the rotated quadrature operator are tunable via the driving field. The optomechanical-like coupling can be strongly enhanced to enter the ultrastrong-coupling regime, where the few-photon optomechanical effects such as photon blockade and macroscopic quantum superposition become accessible. The controllability of the quadrature phase angle provides a new degree of freedom for the manipulation of optomechanical systems and enables the implementation of geometric quantum operations. We also present some discussions on the experimental implementation of this scheme. This study will pave the way to the study of quantum physics and quantum technology at the few-photon level in optomechanical systems.

关键词： Optomechanics Quantum optics

Nonreciprocal Single-Photon Band Structure in a Coupled-Spinning-Resonator chain

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arXiv 2024年

作者： Li, Jing Yang, Ya Xu, Xun-Wei Lu, Jing Jing, Hui Zhou, Lan Key Laboratory of Low-Dimension Quantum Structures and Quantum Control of Ministry of Education Key Laboratory for Matter Microstructure and Function of Hunan Province Synergetic Innovation Center for Quantum Effects and Applications Xiangjiang-Laboratory Department of Physics Hunan Normal University Changsha410081 China Institute of Interdisciplinary Studies Hunan Normal University Changsha410081 China School of Physics and Chemistry Hunan First Normal University Changsha410205 China

We analyze the single-photon band structure and the transport of a single photon in a one-dimensional coupled-spinning-resonator chain. The time-reversal symmetry of the resonators chain is broken by the spinning of the resonators, instead of external or synthetic magnetic field. Two nonreciprocal single-photon band gaps can be obtained in the coupled-spinning-resonator chain, whose width depends on the angular velocity of the spinning resonator. Based on the nonreciprocal band gaps, we can implement a single photon circulator at multiple frequency windows, and the direction of photon cycling is opposite for different band gaps. In addition, reciprocal single-photon band structures can also be realized in the coupled-spinning-resonator chain when all resonators rotate in the same direction with equal angular velocity. Our work open a new route to achieve, manipulate, and switch nonreciprocal or reciprocal single-photon band structures, and provides new opportunities to realize novel single-photon devices. Copyright © 2024, The Authors. All rights reserved.

关键词： Resonators

Cavity Modified Oscillating Bound States with a Λ-type giant emitter in a linear waveguide

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arXiv 2024年

作者： Sun, Ge Yang, Ya Li, Jing Lu, Jing Zhou, Lan Key Laboratory of Low-Dimension Quantum Structures and Quantum Control of Ministry of Education Key Laboratory for Matter Microstructure and Function of Hunan Province Synergetic Innovation Center for Quantum Effects and Applications Xiangjiang-Laboratory Department of Physics Hunan Normal University Changsha410081 China Institute of Interdisciplinary Studies Hunan Normal University Changsha410081 China School of Physics and Chemistry Hunan First Normal University Changsha410205 China

We study a system composed by a three-level giant atom (3GA), a waveguide initially in the vacuum state, and a single-mode cavity. The 3GA-cavity system is in a strong-coupling regime, and the distance between the coupling points is comparable to the coherent length of a spontaneously emitted photon. The dynamics of the 3GA and its radiative field in the waveguide for long time are analyzed. Besides the steady value, we also found an oscillatory character of the excited state population, a signature of oscillating bound states which is generated by the superposition of two bound states in the continuum. The radiative field propagates in the cavity-like geometry formed by the coupling points. When one bound state is emergent, a sine-like interference pattern is visible for the emitted field intensity in spacetime. An oscillatory character in time and a beat in space for the emitted field intensity are observed when two bound states are emergent in a subspace. The wavelengths and the periods are controlled by the number of the photons in the cavity. Copyright © 2024, The Authors. All rights reserved.

关键词： Excited states

Ultrafast growth of high-quality large-sized GaSe crystals by liquid metal promoter

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Nano Research 2022年第5期15卷 4677-4681页

作者： Zuxin Chen Quan Chen Zebing Chai Bin Wei Jun Wang Yanping Liu Yumeng Shi Zhongchang Wang Jingbo Li Institute of semiconductors South China Normal UniversityGuangzhou 510631China School of Materials Sun Yat-Sen UniversityGuangzhou 510275China School of Electrical Engineering and Automation Wuhan UniversityWuhan 430000China School of Physics and Electronics Hunan Key Laboratory for Super-microstructure and Ultrafast ProcessCentral South University932 South Lushan RoadChangsha 410083China Engineering Technology Research Center for 2D Material Information Function Devices and Systems of Guangdong Province International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology of Ministry of EducationInstitute of Microscale OptoelectronicsShenzhen UniversityShenzhen 518060China International Iberian Nanotechnology Laboratory(INL) 4715–330 BragaPortugal

Growth of high-quality large-sized crystals using the traditional chemical vapor transport(CVT)or vertical Bridgman(VB)technique is costly and time-consuming,limiting its practical industrial ***,we propose an ultrafast crystal growth process with low energy consumption and capability of producing crystals of excellent quality,and demonstrate that large-sized GaSe crystals with a lateral size of 0.5 to 1 cm can be obtained within a short period of 5 min.X-ray diffraction(XRD)and scanning transmission electron microscopy(STEM)studies clearly indicate that the as-grown crystals have a good *** further show the potential application of the resulting GaSe crystals,we fabricate the few-layer GaSe-based photodetector,which exhibits low dark current of 21 pA and fast response of 34 ms under 405 nm *** proposed technique for rapid crystal growth could be further extended to other metallenes with low-melting point,such as Bi-,Sn-,In-,Pb-based crystals,opening up a new avenue in fulfilling diverse potential optoelectronics applications of two-dimensional(2D)crystals.

关键词： GaSe ultrafast growth photodetector liquid metal

Insights into varicella-zoster virus assembly from the B-and C-capsid at near-atomic resolution structures

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微生物与宿主健康（英文）

微生物与宿主健康（英文） 2024年第2期2卷 64-74页

作者： Lei Cao Nan Wang Zhe Lv Wenyuan Chen Zhonghao Chen Lifei Song Xueyan Sha Guiqiang Wang Yaling Hu Xiaojun Lian Guoliang Cui Jinyan Fan Yaru Quan Hongrong Liu Hai Hou Xiangxi Wang CAS Key Laboratory of Infection and Immunity National Laboratory of MacromoleculesInstitute of BiophysicsChinese Academy of SciencesBeijingChina Key Laboratory for Matter Microstructure and Function of Hunan Province Key Laboratory of Low-dimensional Quantum Structures and Quantum ControlSchool of Physics and ElectronicsHunan Normal UniversityHunanChina Institute of Medical Research Northwestern Polytechnical UniversityShanxiChina Sinovac(Dalian)Vaccine Technology Co. Ltd.LiaoningChina Sinovac Biotech Ltd. BeijingChina National Institutes for Food and Drug Control BeijingChina

Varicella-zoster is a highly communicable virus that can be transmitted through the airborne *** one quarter of people are infected with this *** studies have described the structure of A-capsid and a blurred reconstruc-tion of the C-capsid with icosahedral *** this study,we have determined the more precise detailed structures of the varicella-zoster virus(VZV)B-and C-capsid in icosahedral symmetry using a combination of block-based recon-struction and symmetry relaxation *** addition,we are reporting structural details of the portal vertex recon-structions in five-fold symmetry and portal reconstructions in twelve-fold *** structures unveil the basis for the high thermal stability of the VZV *** conformational flexibility of structural elements of the capsid plays a role in the assembly of the capsid and drives processes critical for the viral life *** results of the study open up new avenues for the development of drugs against a highly prevalent and contagious pathogen.

关键词： varicella-zoster virus capsid structure virus assembly

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arXiv 2023年

作者： Wang, Yi Zou, Fen Liao, Jie-Qiao Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control Ministry of Education Key Laboratory for Matter Microstructure and Function of Hunan Province Department of Physics Synergetic Innovation Center for Quantum Effects and Applications Hunan Normal University Changsha410081 China Institute of Interdisciplinary Studies Hunan Normal University Changsha410081 China Beijing Computational Science Research Center Beijing100193 China

The preparation of correlated multiphoton sources is an important research topic in quantum optics and quantum information science. Here, two-mode correlated multiphoton bundle emission in a nondegenerate multiphoton Jaynes-Cummings model, which is comprised of a two-level system coupled with two cavity modes is studied. The two-level system is driven by a near-resonant strong laser such that the Mollow regime dominates the physical processes in this system. Under certain resonance conditions, a perfect super-Rabi oscillation between the zero-photon state |0〉a|0〉b and the (n + m)-photon state |n〉a|m〉b of the two cavity modes can take place. Induced by the photon decay, the two-mode correlated multiphoton bundle emission occurs in this system. More importantly, the results show that there is an antibunching effect between the strongly-correlated photon bundles, so that the system behaves as an antibunched (n + m)-photon source. The work opens up a route towards achieving two-mode correlated multiphoton source device, which has potential applications in modern quantum technology. Copyright © 2023, The Authors. All rights reserved.

关键词： Jaynes-Cummings model

Bottom-charmed baryons in a nonrelativistic quark model

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arXiv 2023年

作者： Song, Qing-Fu Lü, Qi-Fang Hosaka, Atsushi Department of Physics Hunan Normal University Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education Changsha410081 China Key Laboratory for Matter Microstructure and Function of Hunan Province Hunan Normal University Changsha410081 China Osaka Ibaraki567-0047 Japan Advanced Science Research Center Japan Atomic Energy Agency Ibaraki Tokai319-1195 Japan

In this work, we study the low-lying mass spectra for bottom-charmed baryons in a nonrelativistic quark model by solving the three-body Schrödinger equation. The lowest Ξbc, Ξ′bc, Ωbc, and Ω′bc states are predicted to be about 6979, 6953, 7109, and 7092 MeV, respectively. Also, the strong decays for the low-lying excited states are investigated. Our results indicate that some of λ−mode P−wave bottom-charmed baryons are relatively narrow, which can be searched for in future experiments. For the low-lying ρ−mode and ρ − λ hybrid states, their strong decays are highly suppressed and they can survive as extremely narrow states. Moreover, the mass spectra and strong decays for bottom-charmed baryons preserve the heavy quark symmetry well. We hope our calculations can provide helpful information for further experimental and theoretical researches. Copyright © 2023, The Authors. All rights reserved.

关键词： Mass spectrometry

Coherent control of spin tunneling in a spin-orbit coupled bosonic triple well

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arXiv 2021年

作者： Luo, Yuxin Yi, Jia Li, Wenjuan Xie, Xin Luo, Xiaobing Luo, Yunrong Key Laboratory for Matter Microstructure and Function of Hunan Province Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control Ministry of Education School of Physics and Electronics Hunan Normal University Changsha410081 China School of Management Hunan University of Information Technology Changsha410151 China Department of Physics Zhejiang Sci-Tech University Hangzhou310018 China Department of Physics Jinggangshan University Ji'an 343009 China

We study the coherent control of spin tunneling for a spin-orbit (SO) coupled boson held in a driven triple well. Under high-frequency approximation, we analytically obtain the quasienergies of the SO-coupled bosonic triple-well system and fine energy band structure is displayed. By adjusting the driving parameters, we reveal that the directed selective spin-flipping or spin-conserving tunneling of a SO-coupled boson occurs along different pathways and in different directions. The analytical results are numerically confirmed and perfect agreements are found. Further, a scheme of quantum spin switch with or without spin-flipping is presented. These results may be useful for quantum information processing and the design of spintronic devices. © 2021, CC BY.

关键词： Bosons