双模SU(1,1)相干态场与2原子相互作用过程中的保真度  

Evolution of the Fidelity of Two-model SU(1,1) Coherent States Interacting with Two Atoms

作　　者：张彦立[1] 李同锴[1] 史严[1] 乔治[1] 

机构地区：[1]石家庄铁道学院数理系,河北石家庄050043

出　　处：《河北大学学报（自然科学版）》2006年第3期253-257,共5页Journal of Hebei University(Natural Science Edition)

摘　　要：运用全量子理论,研究了双模SU(1,1)光场和2原子相互作用模型中保真度的演化特性.结果表明,平均光子数越大,2模光子数差越大,原子和光场之间的相互作用就越大,保真度越小;原子间的耦合常数影响系统、光场和原子的崩溃和回复周期,原子间的耦合常数越大,崩溃周期越短.The properties of the evolution of the fidelities under the interaction of two-mode SU（1, 1） coherent state with two atoms have been investigated. The influences of average photons and the photon-difference of two-mode field and the ratio between atom-atom couple coefficient and atom-field couple coefficient on the fidelity have been discussed. The numerical results show that the more the average photons and the photon-difference are, the lower the fidelities are; When the ratio for atom-atom couple coefficient and atom-field couple coefficient increase, the collapse-period of the fidelities shorten.

关 键 词：保真度 保真度振幅 双模SU(1 1)光场 

分 类 号：O431.2[机械工程—光学工程]