Λ型三能级原子与一个双模腔场的纠缠动力学特性  

Entanglement dynamics properties of the system consisting of a Λ-type atom trapped in two-mode cavity

作　　者：刘超 邬云文[1] LIU Chao;WU Yun-Wen(College of Physics,Mechanical and Electrical Engineering,Jishou University,Jishou 416000,China)

机构地区：[1]吉首大学物理与机电工程学院,吉首416000

出　　处：《原子与分子物理学报》2018年第2期286-292,共7页Journal of Atomic and Molecular Physics

基　　金：国家自然科学基金(11564014);湖南省自然科学基金(2015JJ6092;2016JJ6123);吉首大学校级科研项目(JDY16022)

摘　　要：本文研究了由一个Λ型三能级原子和一个双模腔场构成的系统,在仅考虑1个激发态的情况下,通过对原子、腔模1、腔模2被激发概率的计算,以及对原子冯诺依曼熵的计算,讨论了原子与腔模的耦合强度和失谐系数变化对系统的纠缠动力学特性的影响.研究结果表明:原子熵随时间演化呈周期性,耦合系数影响着原子纠缠度的变换频率,呈正相关,而影响原子纠缠度大小的则是失谐系数,呈负相关.In this paper,we have investigated a system that is composed of aΛ-type three-level atom and a two-mode cavity-field.Under the circumstance of considering only one excited state,by calculating the probability of the excitation of atoms,cavity modes 1 and cavity modes 2,as well as the calculation of atomic von Neumann entropy,we discuss the influence of the coupling strength and the detuning coefficient of the atomic and cavity modes on the entanglement dynamics of the system.The results prove that:the atomic entropy evolves periodically with time,the coupling coefficient influences the degree of the atomic entanglement of transformation frequency,is positively correlated,and affect the size of the degree of the atomic entanglement is detuning factor,a negative correlation.

关 键 词：Λ型三能级原子 双模腔场 动力学特性 量子纠缠 

分 类 号：O438[机械工程—光学工程]