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Few-photon optical diode in a chiral waveguide

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arXiv 2021年

作者： Tan, Jin-Lei Xu, Xun-Wei Lu, Jing Zhou, Lan Synergetic Innovation Center for Quantum Effects and Applications 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

We study the coherent transport of one or two photons in a one-dimensional waveguide chirally coupled to a nonlinear resonator. Analytic solutions of the one-photon and two-photon scattering is derived. Although the resonator acts as a non-reciprocal phase shifter, light transmission is reciprocal at one-photon level. However, the forward and reverse transmitted probabilities for two photons incident from either the left side or the right side of the nonlinear resonator are nonreciprocal due to the energy redistribution of the two-photon bound state. Hence, the nonlinear resonator acts as an optical diode at two-photon level. Copyright © 2021, The Authors. All rights reserved.

关键词： Resonators

Steering sharing for a two-qubit system via weak measurements

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Physical Review A 2021年第5期103卷 052207-052207页

作者： Dan Yao Changliang Ren Chongqing Institute of Green and Intelligent Technology Chinese Academy of Sciences Chongqing 400714 China University of Chinese Academy of Sciences Beijing 100049 China Key Laboratory for Matter Microstructure and Function of Hunan Province Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education School of Physics and Electronics Hunan Normal University Changsha 410081 China

We aim to explore the scenario that a single Alice steers multiple Bobs by using weak measurements. The multiple violations of two different Einstein-Podolsky-Rosen steering inequalities were discussed. Based on unbiased inputs, a single Alice can steer two Bobs when the double violation of the Clauser-Horne-Shimony-Holt-like inequality is realized. Meanwhile, three Bobs can be steered by a single Alice when the triple violation of the three-settings linear steering inequality is observed. More importantly, we theoretically inferred the analytical formula of the maximal violation for the corresponding inequality, which applied an arbitrary two-qubit state.

关键词： Nonlocality Quantum correlations in quantum information Quantum foundations Quantum theory Resource theories

Fast Generation of High-Fidelity Mechanical Non-Gaussian States via Additional Amplifier and Photon Subtraction

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arXiv 2022年

作者： Hu, Dong-Long Zou, Jia-Jin Sun, Feng-Xiao Liao, Jie-Qiao He, Qiongyi Xiang, Ze-Liang School of Physics Sun Yat-sen University Guangzhou510275 China State Key Laboratory for Mesoscopic Physics School of Physics Frontiers Science Center for Nano-Optoelectronics Collaborative Innovation Center of Quantum Matter Peking University Beijing100871 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 Synergetic Innovation Center for Quantum Effects and Applications Hunan Normal University Changsha410081 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 © 2022, CC BY.

关键词： Photons

Multimode optomechanical cooling via general dark-mode control

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Physical Review A 2022年第1期106卷 013526-013526页

作者： Jian Huang Deng-Gao Lai Cheng Liu Jin-Feng Huang Franco Nori Jie-Qiao Liao 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 Theoretical Quantum Physics Laboratory RIKEN Cluster for Pioneering Research Wako-shi Saitama 351-0198 Japan RIKEN Center for Quantum Computing 2-1 Hirosawa Wako-shi Saitama 351-0198 Japan Physics Department University of Michigan Ann Arbor Michigan 48109-1040 USA

The dark-mode effect is a stubborn obstacle for ground-state cooling of multiple degenerate mechanical modes optomechanically coupled to a common cavity-field mode. Here we propose an auxiliary-cavity-mode method for simultaneous ground-state cooling of two degenerate or near-degenerate mechanical modes by breaking the dark mode. We find that the introduction of the auxiliary cavity mode not only breaks the dark-mode effect, but also provides a new cooling channel to extract the thermal excitations stored in the dark mode. Moreover, we study the general physical-coupling configurations for breaking the dark mode in a generalized network-coupled four-mode optomechanical system consisting of two cavity modes and two mechanical modes. We find the analytical dark-mode-breaking condition in this system. This method is general and it can be generalized to break the dark-mode effect and to realize the simultaneous ground-state cooling in a multiple-mechanical-mode optomechanical system. We also demonstrate the physical mechanism behind the dark-mode breaking by studying the breaking of dark-state effect in the N−type four-level atomic system. Our results not only provide a general method to control various dark-mode and dark-state effects in physics, but also present an opportunity to the study of macroscopic quantum phenomena and applications in multiple-mechanical-resonator systems.

关键词： Optomechanics Quantum optics

Steering paradox for Einstein–Podolsky–Rosen argument and its extended inequality

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Photonics Research 2021年第6期9卷 992-1002页

作者： TIANFENG FENG CHANGLIANG REN QIN FENG MAOLIN LUO XIAOGANG QIANG JING-LING CHEN XIAOQI ZHOU State Key Laboratory of Optoelectronic Materials and Technologies and School of Physics Sun Yat-sen UniversityGuangzhou 510275China Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education Key Laboratory for Matter Microstructure and Function of Hunan ProvinceDepartment of Physics and Synergetic Innovation Center for Quantum Effects and ApplicationsHunan Normal UniversityChangsha 410081China National Innovation Institute of Defense Technology AMSBeijing 100071China Theoretical Physics Division Chern Institute of MathematicsNankai UniversityTianjin 300071China

The Einstein–Podolsky–Rosen(EPR)paradox is one of the milestones in quantum foundations,arising from the lack of a local realistic description of quantum *** EPR paradox has stimulated an important concept of“quantum nonlocality,”which manifests itself in three types:quantum entanglement,quantum steering,and Bell’s *** Bell’s nonlocality is more often used to show“quantum nonlocality,”the original EPR paradox is essentially a steering *** this work,we formulate the original EPR steering paradox into a contradiction equality,thus making it amenable to experimental *** perform an experimental test of the steering paradox in a two-qubit ***,by starting from the steering paradox,we generate a generalized linear steering inequality and transform this inequality into a mathematically equivalent form,which is friendlier for experimental implementation,i.e.,one may measure the observables only in the x,y,or z axis of the Bloch sphere,rather than other arbitrary *** also perform experiments to demonstrate this *** the experimental errors,the experimental results coincide with theoretical *** results deepen the understanding of quantum foundations and provide an efficient way to detect the steerability of quantum states.

关键词： inequality quantum Einstein

Noise-Tolerant Optomechanical Entanglement via Synthetic Magnetism

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Physical Review Letters 2022年第6期129卷 063602-063602页

作者： Deng-Gao Lai Jie-Qiao Liao Adam Miranowicz Franco Nori 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 Theoretical Quantum Physics Laboratory RIKEN Cluster for Pioneering Research Wako-shi Saitama 351-0198 Japan Institute of Spintronics and Quantum Information Faculty of Physics Adam Mickiewicz University 61-614 Poznań Poland Physics Department The University of Michigan Ann Arbor Michigan 48109-1040 USA

Entanglement of light and multiple vibrations is a key resource for multichannel quantum information processing and memory. However, entanglement generation is generally suppressed, or even fully destroyed, by the dark-mode (DM) effect induced by the coupling of multiple degenerate or near-degenerate vibrational modes to a common optical mode. Here we propose how to generate optomechanical entanglement via DM breaking induced by synthetic magnetism. We find that at nonzero temperature, light and vibrations are separable in the DM-unbreaking regime but entangled in the DM-breaking regime. Remarkably, the threshold thermal phonon number for preserving entanglement in our simulations has been observed to be up to 3 orders of magnitude stronger than that in the DM-unbreaking regime. The application of the DM-breaking mechanism to optomechanical networks can make noise-tolerant entanglement networks feasible. These results are quite general and can initiate advances in quantum resources with immunity against both dark modes and thermal noise.

关键词： Light-matter interaction Optomechanics Quantum optics

Gaussian beam quantum radar protocol

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arXiv 2023年

作者： Maccone, Lorenzo Zheng, Yi Ren, Changliang Dip. Fisica INFN Sez. Pavia University of Pavia via Bassi 6 PaviaI-27100 Italy CAS Key Laboratory of Quantum Information University of Science and Technology of China Hefei230026 China CAS Center for Excellence in Quantum Information and Quantum Physics University of Science and Technology of China Hefei230026 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 Synergetic Innovation Center for Quantum Effects and Applications Hunan Normal University Changsha410081 China

We present an entangled quantum radar protocol. It consists in scanning the sky with a thin Gaussian beam and measuring the travel time of the radiation reflected from the target, as in conventional radars. Here the Gaussian beam is composed of N photons entangled in the frequency degrees of freedom. We show that this provides a √N quantum enhancement over the unentangled case, as is usual in quantum metrology. © 2023, CC BY.

关键词： Gaussian beams

Quantum dual-path interferometry scheme for axion dark matter searches

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arXiv 2022年

作者： Yang, Qiaoli Gao, Yu Peng, Zhihui College of Physics and Optoelectronic Engineering Department of Physics Jinan University Guangzhou510632 China Key Laboratory of Particle Astrophysics Institute of High Energy Physics Chinese Academy of Sciences Beijing100049 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 Synergetic Innovation Center for Quantum Effects and Applications Hunan Normal University Changsha410081 China

Exploring the mysterious dark matter is a key quest in modern physics. Currently, detecting axions, a hypothetical particle proposed as a primary component of dark matter, remains a significant challenge due to their weakly interacting nature. Here we show at quantum level that in a cavity permeated by a magnetic field, the single axion-photon conversion rate is enhanced by the cavity quality factor and is quantitatively larger than the classical result by π/2. The axion cavity can be considered a quantum device emitting single photons with temporal separations. This differs from the classical picture and reveals a possibility for the axion cavity experiment to handle the signal sensitivity at the quantum level, e.g., a dual path quantum interferometry with cross-power and second-order correlation measurements. This scheme would greatly reduce the signal scanning time and improve the sensitivity of the axion-photon coupling, potentially leading to the direct observation of axions. Copyright © 2022, The Authors. All rights reserved.

关键词： Photons

Understanding the nature of Ω(2012) in a coupled-channel approach

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arXiv 2022年

作者： Lü, Qi-Fang Nagahiro, Hideko 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 Department of Physics Nara Women’s University Nara630-8506 Japan Advanced Science Research Center Japan Atomic Energy Agency Ibaraki Tokai319-1195 Japan

We perform a systematic analysis of the mass and strong decays of the Ω(2012) resonance in a coupled-channel approach of a bare three-quark state and a composite meson-baryon state. Besides the coupling of the bare state and Ξ∗ K¯ channel, the effective meson-baryon interactions are also included. We find a pole with mass of 2008 MeV by solving the Bethe-Salpeter equation. The calculated decay widths and its ratios of branching fractions RΞΞπK¯K¯ agree well with the new experimental measurement by Belle Collaboration. Our results suggest that both three-quark core and Ξ∗ K¯ channel are essential for the description of the Ω(2012) resonance. We expect that present calculations can help us to better understand the nature of Ω(2012) resonance. Copyright © 2022, The Authors. All rights reserved.

关键词： Hadrons