二能级原子与单模光场系统中的保真度演化特性  

Properties of fidelity evolution in the system composed of two-level atoms and single-model field

作　　者：王菊霞[1] 

机构地区：[1]渭南师范学院物理与电气工程学院,光量子信息工程中心,陕西渭南714000

出　　处：《激光杂志》2013年第1期19-20,共2页Laser Journal

基　　金：陕西省自然科学基金项目(SJ08A25);陕西省军民融合研究基金项目(11JMR01);渭南师范学院培育项目(11YKP015);渭南市自然科学基础研究计划项目(2012KYJ-2)

摘　　要：利用全量子理论,分析了原子耦合时双原子与光场依赖于强度耦合的相互作用,得出了原子保真度演化过程的解析规律,结果表明:原子的保真度随时间的变化呈现出振荡性,而且在某些瞬时光场恢复为初始的相干态,其它更多的相互作用期间原子的保真度值小于1,即原子与光场处于复杂的纠缠状态,说明原子与光场的相互作用使得初始的纠缠态既可能保持也可能消纠缠。The process of twoatom interacting with light field under considering atom- atom coupling and intensitydependent coppling are investigated by mean of full quantum theory. The analysis law of evolutionary process of atomical fidelity is obtained. It is found that the variation of atomical fidelity with time presents the oscillation characteristics. The light field could revert to the initial coherent state at some microtime and the value of atomical fidelity less than 1 during most of interacting process, that is, both light fields and atoms are in complex entangled states. The above mentioned show that the interaction between atoms and light fields may leads to maintaining or canealing the initial entanglement states.

关 键 词：量子光学 纠缠 保真度 演化规律 

分 类 号：O431.2[机械工程—光学工程]