两纠缠原子与光场相互作用系统场熵演化特性  

Entropy properties in the system of two identical two-level entangled atoms interacting with coherent state

作　　者：宋军[1] 沈金玲[1] 张刚[1] 曹卓良[2] 

机构地区：[1]皖西学院数理系,六安237012 [2]安徽大学物理与材料科学学院,合肥230039

出　　处：《原子与分子物理学报》2006年第4期699-703,共5页Journal of Atomic and Molecular Physics

基　　金：安徽省教育厅自然科学研究项目(2005kj235)

摘　　要：研究了两纠缠原子与相干态光场相互作用系统场熵的时间演化特性,运用全量子力学理论和数值方法,讨论了初始两原子所处的纠缠状态、纠缠度和腔内光场的强弱对场熵的影响.随着光场平均光子数的增加,系统场熵均值和振荡频率增大;光场较弱时,场熵呈现一定的周期性振荡;光场增强后,场熵呈现出周期性的崩塌与回复,且随初始两原子纠缠度的增加,场熵的振幅增大.In this article, the time evolution properties of the field entropy in the system of the two identical two-level entangled atoms interacting with the single-mode coherent light field are studied by means of full quantum theory. The influences of the initial states and the degree of entanglement of two identical two-level entangled atoms and the intensity of the light field on the field entropy are discussed by numerical calculations. The results show that the average value and the oscillation frequency of the field entropy increases with the increasing of the mean photon number, the oscillation of the field entropy presents stated periods in the weak light field and presents collapses and revivals in the increased light field, the amplitudes of fidd entropy increase with increasing initial degree of entanglement of two entangled atoms.

关 键 词：量子光学 熵 纠缠原子 纠缠度 相干态 

分 类 号：O431.2[机械工程—光学工程]