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Entangling two oscillating mirrors in an optomechanical system via a flying atom

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Chinese Physics B 2018年第7期27卷 357-361页

作者： Yu-Bao Zhang Jun-Hao Liu Ya-Fei Yu Zhi-Ming Zhang Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices（SIPSE） Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum MaterialsSouth China Normal UniversityGuangzhou 510006China

We propose a novel scheme for generating the entanglement of two oscillating mirrors in an optomechanical system via a flying atom. In this scheme, a two-level atom, in an arbitrary superposition state, passes through an optomechanical system with two oscillating cavity-mirrors, and then its states are detected. In this way, we can generate the entangled states of the two oscillating mirrors. We derive the analytical expressions of the entangled states and make numerical calculations. We find that the entanglement of the two oscillating mirrors can be controlled by the initial state of the atom, the optomechanical coupling strength, and the coupling strength between the atom and the cavity field. We investigate the dynamics of the system with dissipations and discuss the experimental feasibility.

关键词： quantum entanglement optomechanical system dissipative dynamics

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量子弱测量中纠缠对参数估计精度的影响

物理学报 2021年第24期70卷 40-47页

作者：张晓东於亚飞张智明华南师范大学信息光电子科技学院广东省微纳米光子功能材料与器件重点实验室广州510006 华南师范大学广东省量子调控工程与材料重点实验室广州510006

量子弱测量过程中适当的弱值可用于放大微弱物理参数并提高参数评估的精度,这种参数评估精度的提高可能来源于体系中的纠缠.本文借助Fisher信息研究了系统中的纠缠和系统与探针间的纠缠对弱测量过程中系统与探针间耦合参数的评估精度的... 详细信息

量子弱测量过程中适当的弱值可用于放大微弱物理参数并提高参数评估的精度,这种参数评估精度的提高可能来源于体系中的纠缠.本文借助Fisher信息研究了系统中的纠缠和系统与探针间的纠缠对弱测量过程中系统与探针间耦合参数的评估精度的影响.分析了系统初态分别为类GHZ态的纠缠纯态和受退极化噪声影响的纠缠混态的纠缠,以及系统和探针间的纠缠对参数评估的影响.研究表明,当系统初态为类GHZ态的纠缠纯态和受退极化噪声影响的纠缠混态时, Fisher信息随系统初态纠缠度的增大而增大,且系统初末态均为最大纠缠态时, Fisher信息和后选择概率均达到最大;但系统与探针的纠缠越弱,测量能获得的Fisher信息越多,参量估计的精度越高.此研究结果表明系统中的纠缠会提高参数评估精度,而系统与探针间的纠缠则会降低参数评估的精度.

关键词：弱测量弱值纠缠 Fisher信息

Effects of the Casimir force on the properties of a hybrid optomechanical system

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Chinese Physics B 2019年第1期28卷 379-384页

作者： Yi-Ping Wang Zhu-Cheng Zhang Ya-Fei Yu Zhi-Ming Zhang Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices(School of Information and Optoelectronic Science and Engineering) Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum MaterialsSouth China Normal University

We investigate the effects of the Casimir force on the output properties of a hybrid optomechanical system. In this system, a nanosphere is fixed on the movable-mirror side of the standard optomechanical system, and the nanosphere interacts with the movable-mirror via the Casimir force, which depends on the mirror–sphere separation. In the presence of the probe and control fields, we analyze the transmission coefficient and the group delay of the field-component with the frequency of the probe field. We also study the transmission intensity of the field-component with the frequency of a newly generated four-wave mixing(FWM) field. By manipulating the Casimir force, we find that a tunable slow light can be realized for the field-component with the frequency of the probe field, and the intensity spectrum of the FWM field can be enhanced and shifted effectively.

关键词： quantum optics optomechanics quantum information and processing

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在光学系统中利用弱值放大模拟搜索算法

光学学报 2022年第3期42卷 254-259页

作者：刘洧宁刘军浩於亚飞张智明华南师范大学信息光电子科技学院广东省微纳光子功能材料与器件重点实验室广东广州510006 华南师范大学广东省量子调控工程与材料重点实验室广东广州510006

提出了一种在光学系统中利用弱值放大和后选择来模拟搜索算法的方案。该方案将数据库编码在入射光束的横向坐标上,在光束的偏振态上进行预选择与后选择。首先讨论了一般型入射光束并获得一些结果,然后对高斯型入射光束进行了分析。结果... 详细信息

提出了一种在光学系统中利用弱值放大和后选择来模拟搜索算法的方案。该方案将数据库编码在入射光束的横向坐标上,在光束的偏振态上进行预选择与后选择。首先讨论了一般型入射光束并获得一些结果,然后对高斯型入射光束进行了分析。结果表明通过适当地选择辅助系统的后选择态并且利用弱值放大,有可能仅用一次迭代就实现对数据库的搜索。

关键词：量子光学量子信息处理量子搜索算法量子计算弱值放大

Negativity of Wigner function and phase sensitivity of an SU(1,1) interferometer

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Chinese Physics B 2019年第6期28卷 121-125页

作者： Chun-Li Liu Li-Li Guo Zhi-Ming Zhang Ya-Fei Yu Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices School of Information and Optoelectronic Science and EngineeringGuangdong Provincial Key Laboratory of Quantum Engineering and Quantum MaterialsSouth China Normal UniversityGuangzhou 510006China

Both the negativity of Wigner function and the phase sensitivity of an SU(1,1) interferometer are investigated in this paper. In the case that the even coherent state and squeezed vacuum state are input into the interferometer, the Heisenberg limit can be approached with parity detection. At the same time, the negativity volume of Wigner function of detection mode comes entirely from the input state and varies periodically with the encoding phase. In addition, the negativity volume of Wigner function is positively correlated with the phase sensitivity of the SU(1,1) interferometer. The positive correlation may mean that the non-classicality indicated by negative Wigner function is a kind of resource that can verify some related research results of phase estimation.

关键词： SU(1,1) interferometer Wigner function phase sensitivity

Photon-phonon squeezing and entanglement in a cavity optomechanical system with a flying atom

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Frontiers of physics 2019年第1期14卷 93-98页

作者： Jun-Hao Liu Yu-Bao Zhang Ya-Fei Yu Zhi-Ming Zhang Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials & Devices (SIPSE) and Guangdong Provincial Key Laboratory of Quantum Engineering & Quantum Materials South China Normal University Guangzhou 510006 China Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials & Devices (SIPSE) and Guangdong Provincial Key Laboratory of Quantum Engineering & Quantum Materials South China Normal University Guangzhou 510006 China

We study the quadrature squeezing and entanglement in a cavity optomechanical system (COMS). In our model, a flying atom sequentially passes through and interacts with the COMS and a Ramsey pulse zone, and subsequently the atomic state is detected. In this way, the photon-phonon squeezing and entanglement can be generated. The dynamic evolution of the squeezing and entanglement in the presence of losses are examined by using the master equation method.

关键词： optomechanics squeezing entanglement

Optical nonreciprocity in a piezo-optomechanical system

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Chinese Physics B 2020年第7期29卷 321-325页

作者： Yu-Ming Xiao Jun-Hao Liu Qin Wu Ya-Fei Yu Zhi-Ming Zhang Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices and School of Information and Optoelectronic Science and EngineeringSouth China Normal UniversityGuangzhou 510006China Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials South China Normal UniversityGuangzhou 510006China School of Biomedical Engineering Guangdong Medical UniversityDongguan 523808China

We theoretically study the optical nonreciprocity in a piezo-optomechanical microdisk resonator,in which the cavity modes and the mechanical mode are optically pumped and piezoelectrically driven,*** asymmetric optical pumping and different piezoelectrical drivings,our system shows some nonreciprocal optical *** find that our system can function as an optical isolator,a nonreciprocal amplifier,or a nonreciprocal phase shifter.

关键词： quantum optics cavity optomechanical system optical nonreciprocity piezoelectric force

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双腔光力系统中机械振子的基态冷却

量子光学学报 2018年第2期24卷 170-177页

作者：曹智伊蔡秋华於亚飞张智明华南师范大学广东省微纳光子功能材料与器件重点实验室信息光电子科技学院华南师范大学广东省量子调控工程与材料重点实验室

宏观机械系统的量子操控无论是在基础物理学还是在高精度测量和量子信息处理等的应用上都非常重要。其中关键的一步是将机械系统冷却到它的量子基态。本文提出了一个光力系统，该系统包含了两个光学模式和一个与这两个光学模式都发生相... 详细信息

宏观机械系统的量子操控无论是在基础物理学还是在高精度测量和量子信息处理等的应用上都非常重要。其中关键的一步是将机械系统冷却到它的量子基态。本文提出了一个光力系统，该系统包含了两个光学模式和一个与这两个光学模式都发生相互作用的机械模式。此外，这两个腔模还分别由两束光驱动。通过对哈密顿量进行变换以及求解系统的海森堡一郎之万方程，得到了机械振子最终平均声子数的表达式。结合作图发现，这个系统的特殊结构可以实现在不可分辨边带情况下机械振子的基态冷却，所以系统对腔的品质因子要求降低，实验上更容易实现。另外还发现，通过调节驱动光的功率可使得冷却效果达到最好。

关键词：量子光学光力系统基态冷却

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一种基于弱测量的参量评估方案

量子光学学报 2021年第3期27卷 200-206页

作者：尹霜於亚飞张智明华南师范大学光电学院微纳光子功能材料与器件重点实验室广东广州510006 华南师范大学广东省量子调控工程与材料重点实验室广东广州510006

弱测量过程包括三个主要步骤:初态制备、弱耦合、后选择.这个过程中诸多因素会对耦合参量的评估精度产生影响,本文工作主要探讨当光束的空间自由度与偏振自由度通过双折射晶体耦合时,探针初态的参数(坐标分布的平均值和方差)、耦合常数... 详细信息

弱测量过程包括三个主要步骤:初态制备、弱耦合、后选择.这个过程中诸多因素会对耦合参量的评估精度产生影响,本文工作主要探讨当光束的空间自由度与偏振自由度通过双折射晶体耦合时,探针初态的参数(坐标分布的平均值和方差)、耦合常数以及后选择角对耦合参量的评估精度的影响.我们具体通过讨论相关参数对待评估耦合参量Fisher信息的影响,借以分析对耦合参数评估精度的影响.结果表明,在本方案中,(1)增加探针初态坐标分布的方差和坐标的平均值(中心位置)都可以提高后选择概率,并增加总Fisher信息;(2)参量越小,评估精度越高,但相应的后选择概率越低;(3)在满足弱测量近似条件下,系统的后选择态与初态越接近正交,获得的评估精度越高.

关键词：弱测量参量评估 Fisher信息