选择原子测量对原子与光场纠缠特性的影响  

The influences of the selective atomic measurement on entanglement properties between atom inside cavity and light field

作　　者：卢道明[1] 

机构地区：[1]武夷学院电子工程系,福建武夷山354300

出　　处：《光学技术》2011年第1期66-70,共5页Optical Technique

基　　金：福建省自然科学基金资助项目(2008J0217)

摘　　要：考虑将初始处于纠缠态的一个原子注入处于Fock态的单模腔中,并且原子与光场发生共振相互作用的情况,采用Negativity熵来描述两子系统间的纠缠,运用数值计算方法研究了腔內原子与光场间的纠缠特性。通过是否进行原子态选择性测量情况下,对腔內原子与光场间的纠缠特性的比较,讨论了腔外原子的测量对纠缠特性的影响。研究结果表明:通过对腔外原子的选择性测量,可增强腔內原子与光场间的纠缠。Considering two two-level atoms initially in the entanglement state,one atom of two atoms is put into initially Fock state light cavity and has resonant interaction.The entanglement evolution between atom in cavity and light field is investigated.Negativity is used to quantify the degree of entanglement.Through comparing the results if direct selective measurement is performed or not,the influences of state-selective measurement of the atom outside the cavity on the entanglement properties of between atom inside cavity and field are discussed.The results obtained using the numerical method show that the entanglement between atom inside cavity and light field is strengthened through the state-selective measurement of the atom outside the cavity.

关 键 词：量子光学 二能级原子 选择原子测量 量子纠缠 

分 类 号：O431.2[机械工程—光学工程]