在外场作用下三量子比特量子纠缠演化特性的研究  

Evolution Characteristics of Three-Qubit Quantum Entanglement Under External Field Effect

作　　者：罗卫东 周旋 周小清 邬云文[1] 黄尚江 Luo Weidong;Zhou Xuan;Zhou Xiaoqing;Wu Yunwen;Huang Shangjiang(College of Physics,Mechanical and Electrical Engineering,Jishou University,Jishou,Hunan 416000,China;College of Information Science and Engineering,Jishou University,Jishou,Hunan 416000,China;Hunan Province Higher Education Key Laboratory of Modeling and Monitoring on the Near-Earth Electromagnetic Environments,Changsha University of Science and Technology,Changsha,Hunan 410015,China)

机构地区：[1]吉首大学物理与机电工程学院,湖南吉首416000 [2]吉首大学信息科学与工程学院,湖南吉首416000 [3]长沙理工大学近地空间电磁环境监测与建模实验室,湖南长沙410015

出　　处：《激光与光电子学进展》2021年第21期302-309,共8页Laser & Optoelectronics Progress

基　　金：国家自然科学基金(61865006,11964010);湖南省自然科学基金(2019JJ50481);湖南省教育厅科研课题(20C1534);湖南省高校重点实验室项目(N201901);吉首大学校级科研课题(Jdy19036)。

摘　　要：采用相干态正交化展开方法,对三量子比特的纠缠度影响因素进行了分析研究,并运用数值计算,结合解析解,在光场初态为真空态的相互作用过程中,对三量子比特的纠缠情况进行了研究。分析了三个全同的量子比特纠缠度随光场频率的变化规律以及光场量子比特耦合强度对三量子比特纠缠度的影响。研究结果表明,三量子比特的本征能量和共生纠缠度随光场频率、时间g_(0)t的演化与耦合强度有关,而三量子比特的本征能量和共生纠缠度随时间gt的演化与耦合强度无关。The coherent state orthogonalization expansion method is used to analyze and investigate the factors influencing the three-qubit entanglement degree.In addition,the three-qubit entanglement in the interaction process with the vacuum state as the initial state of the light field is investigated by numerical calculation combined with analytical solution.The relationship between the entanglement degree of three identical qubits and the light field frequency as well as the influence of light-field-qubit coupling strength on the three-qubit entanglement degree is analyzed.The research results show that the evolutions of the three-qubit intrinsic energy and the three-qubit cooccurrence entanglement degree with light field frequency and time g_(0)t are related to the coupling strength,while the evolutions with time gt have nothing to do with the coupling strength.

关 键 词：量子光学 量子纠缠 相干态正交化 真空态 GHZ模型 

分 类 号：O455[理学—无线电物理]