N+2原子受简并双光子作用时的纠缠动力学  

Entanglement dynamics of N+2 atoms interacting with degenerate two photons

作　　者：张晓东[1] 王中结[1] 

机构地区：[1]安徽师范大学物理与电子信息学院,芜湖241000

出　　处：《原子与分子物理学报》2011年第6期1082-1088,共7页Journal of Atomic and Molecular Physics

基　　金：安徽省自然科学基金(090412060);安徽省教育厅自然科学基金(KJ2008A029)

摘　　要：研究了N+2(其中N个原子与光场非共振作用,2个原子与光场共振作用)原子受简并双光子作用的纠缠动力学,得到2个共振原子的纠缠度的解析表达式.结果表明:在简并双光子作用下,纠缠度的时间演化出现有规则的崩塌回复现象,并且崩塌回复周期比单光子作用下时要短.此外,N+2原子与光场间的相对耦合系数对简并双光子情形下的纠缠度有更灵敏的影响.The entanglement dynamics of N＋ 2 atoms （in which N atoms interact resonantly wltla light field, two atoms interact non-resonantly with light field）interacting with degenerate two-photos is inves- tigated and an analytical expression of concurrence for 2 resonant atoms is obtained. The results show： the time evolution of the entanglement of N q-2 atoms interacting with degenerate two-photons displays a typical collapse-revival structure, and the collapse-revival period of the concurrence of N ＋ 2 atoms is smaller than that of N＋2 atoms interacting with single photon. In addition, the relative coupling coefficient r of N＋2 atoms with light field has obvious effect on the collapse-revival characteristic.

关 键 词：纠缠动力学 共生纠缠度 简并双光子 

分 类 号：O56[理学—原子与分子物理]