激光与光电子学进展, 2017, 54 (3): 032701, 网络出版: 2017-03-08
两子系统间纠缠演化特性
Evolution Property of Entanglement Between Two Subsystems
量子光学 共生纠缠 原子间距离 集体阻尼 偶极-偶极相互作用 quantum optics concurrence entanglement interatomic distance collective damping dipole-dipole interaction
摘要
研究了两个二能级原子与共同热库发生相互作用的系统纠缠动力学演化,采用共生纠缠描述了子系统间的纠缠,通过数值计算分析了初始状态和原子间距对两原子间纠缠演化的影响,以及耦合强度和失谐量对两子系统间纠缠演化的影响。结果表明,原子间距较小时,无论初态是对称态还是反对称态,原子间纠缠都会产生快速振荡现象。随着原子间距的增加,原子间相互作用减弱,强耦合下会出现纠缠死亡和纠缠复苏的现象。增加失谐量能够抑制纠缠从原子转移到热库。
Abstract
The dynamical evolution of entanglement between two systems of two-level atoms interacting with a common heat reservoir is investigated and the entanglement between subsystems is described by using the concurrence entanglement. By means of numerical calculations, the effects of initial state and interatomic distance on the two-atom-entanglement evolution as well as the effects of coupling strength and detuning on the two-subsystem-entanglement evolution are analyzed. The results show that, when the interatomic distance is relatively small, the rapid oscillation phenomenon appears no matter whether the initial state is symmetrical state or anti-symmetrical state. The interaction between atoms decreases with the increase of interatomic distance. Under strong coupling, the phenomena of entanglement death and entanglement recovery appear. The entanglement transfer from atoms to heat reservoir is suppressed when the increasing detuning.
闫丽. 两子系统间纠缠演化特性[J]. 激光与光电子学进展, 2017, 54(3): 032701. Yan Li. Evolution Property of Entanglement Between Two Subsystems[J]. Laser & Optoelectronics Progress, 2017, 54(3): 032701.