双模场与原子相互作用中的量子纠缠和内禀退相干  

Entanglement and intrinsic decoherence in the interaction between two-mode field and atom

作　　者：谭霞[1] 张成强[1] 夏云杰[1] 

机构地区：[1]曲阜师范大学物理工程学院,曲阜273165

出　　处：《物理学报》2006年第5期2263-2268,共6页Acta Physica Sinica

基　　金：国家自然科学基金重点项目(批准号:10534030)资助的课题~~

摘　　要：通过求解系统的Milburn方程,研究了两能级原子与双模SU(1,1)相干态光场发生相互作用系统中,原子与场的纠缠及双模SU(1,1)相干态场的模间纠缠随时间的演化问题,讨论了内禀退相干、双模光子数差等对纠缠度的影响.结果表明,存在内禀退相干时,随着时间的演化,场-原子纠缠逐渐减小到一个确定值,而模间纠缠逐渐增大到一个确定值,两者演化的最终值只取决于双模光子数差和平均光子数,而与内禀退相干因子无关.Considering the interaction between two-mode SU（ 1,1 ） coherence states and a two-level atom, we find an exact solution of the Milbum equation for the system . We investigate the time evolution of the entanglement of field-atom and one of two modes of field using the quantum-reduced entropy and quantum relative entropy, respectively. The influences of intrinsic decoherence and two-mode photon number difference on the evolution of the entanglement of field-atom and one of two modes of field are discussed. It is shown that the entanglement of field-atom reduces to a stationary value with time evolution and the entanglement between two modes increases to another stationary value with intrinsic decoherence, and the values only depend on the two-mode photon number and mean photon number.

关 键 词：Milburn理论 SU(1 1)相干态 量子约化熵 量子相对熵 

分 类 号：O413[理学—理论物理]