量子化场中运动二能级原子的纠缠动力学(英文)  

Entanglement Dynamics of a Moving Two-level Atom in a Quantized Field

作　　者：杨昆党[1] 马青山[1,2] 张军[1] 

机构地区：[1]新疆大学物理科学与技术学院,新疆乌鲁木齐830046 [2]西安交通大学物理系,陕西西安710049

出　　处：《新疆大学学报（自然科学版）》2010年第3期253-257,275,共6页Journal of Xinjiang University(Natural Science Edition)

基　　金：Supported by the NNSF of P.R.C(10547010);Youth Fund of XJU(070298)

摘　　要：研究了处于单模量子化场中的运动二能级原子的纠缠动力学,讨论了子系统的熵变和原子-场耦合系统的共生纠缠.结果表明:原子初态处于基态时,熵变呈反关联演化,随着原子处在激发态几率的增加这种行为逐渐被正关联行为所替代.除此之外,还发现:共生纠缠的振幅随着原子处在激发态几率的增加而增加.另外,熵变和共生纠缠的振幅随着原子的质心运动的加强而下降.The entanglement dynamics of a two-level atom with center-of-mass motion in a single-mode quantized field is investigated. The behavior of the entropy changes of the subsystems, as well as the concurrence of the coupled atom-field system is explored. These results show that when the atom is initially prepared in ground state anti-correlation behavior occurs, but a positively correlated behavior appears gradually as the increasing of the probability of the atom initially in excited state. Also, the amplitude of the concurrence increases with the increasing of the probability of the atom initially in excited state. In addition, with increasing of the atomic center-of-mass motion, both the amplitudes of the partial entropy changes and the concurrence are reduced.

关 键 词：纠缠 质心运动 熵变 共生纠缠 

分 类 号：O431.2[机械工程—光学工程]