Kerr介质中双模纠缠相干光与Bell态原子相互作用系统的原子偶极压缩  

Dipole squeezing in the system of the two-mode entangled coherent field interacting with atoms in Bell states in Kerr medium

作　　者：林继成[1] 郑小虎[2] 曹卓良[2] 

机构地区：[1]南京晓庄学院物理系,南京210017 [2]安徽大学物理与材料科学学院,合肥230039

出　　处：《物理学报》2007年第2期837-844,共8页Acta Physica Sinica

基　　金：安徽省自然科学基金(批准号:03042401);安徽省教育厅重点项目基金(批准号:2006kj070A)资助的课题~~

摘　　要：运用全量子理论并结合数值计算方法,研究了Kerr介质腔中处于Bell态的两个全同二能级纠缠原子与双模纠缠相干光场相互作用系统的原子偶极压缩特性.讨论了双原子体系的初态、光场的平均光子数、双模纠缠相干光场的纠缠程度以及Kerr介质与双模光场的耦合强度对原子偶极压缩特性的影响.结果表明:双原子体系的初态为β11〉时,不会出现偶极压缩效应;初态为β00〉,β01〉或β10〉时在一定条件下可能出现原子压缩效应,且此时原子压缩的特性与Kerr介质与双模光场的耦合强度、初始光场的平均光子数、双模纠缠相干光场的纠缠程度有关.The atomic dipole squeezing effect in the system of two identical two-level atoms in the Bell state interacting with the twomode entangled coherent state field in Kerr medium are investigated by means of solving the Schroedinger equation and numerical calculations. The effects on the atomic dipole squeezing effect produced by the atomic initial state, mean photon number of light field, the degree of the entanglement of the entangled coherent field, the coupling strength of the Kerr medium with the light field and the coupling strength of dipole-dipole interaction between atoms are discussed. The results show that the dipole squeezing effect does not appear for the Bell state ｜β11 〉, while there can be dipole squeezing effect under certain conditions for the Bell states ｜ β00〉 or ｜β01〉 or ｜ β10〉. In the latter case, the dipole squeezing effect depends on the coupling strength of the Kerr medium with the light field, the mean＇ photon number and the degree of entanglement of the two-mode entangled coherent field.

关 键 词：量子光学 BELL态 双模纠缠相干光场 KERR介质 

分 类 号：O431.2[机械工程—光学工程]