热辐射中存在偶极相互作用的原子量子态保真度研究  

Fidelity of a Pair of Atoms by Dipole-dipole Interaction Quantum States in Thermal Radiation Field

作　　者：张登玉[1] 高峰[1] 

机构地区：[1]衡阳师范学院物理系,湖南衡阳421008

出　　处：《光子学报》2008年第3期600-603,共4页Acta Photonica Sinica

基　　金：湖南省教育厅重点科学研究项目(04A006)资助

摘　　要：建立了两个两能级原子置于热辐射场环境中的模型,当计及原子偶极间的相互作用时,利用密度矩阵方法,得到两能级原子密度矩阵元随时间的演化规律.针对三种不同的初始状态,分析置于强热辐射场中原子量子态保真度.结果表明:两个原子初始处于不同量子叠加态,量子信息在传输过程中可能发生部分失真,也可能不失真.初始状态对量子信息失真的快慢程度有明显的影响.A model is built when the two two-level atoms is in thermal radiation field environment. By means of the density rectangular method, two two-level atoms＇ reducible density rectangular array is obtained when atoms by dipole-dipole interaction are put in a thermal reservoir. The problem of fidelity of two-level atoms is studied which are put in the strongly thermal radiation field. It is shown that the two two-level atoms initially situated in different coherent superposition states, quantum information may lose fidelities partly or may not lose fidelities during evolution in transmit process. The initial states may influence the losing fidelities speed obviously.

关 键 词：原子 热辐射场 保真度 相干 消相干 

分 类 号：O431.2[机械工程—光学工程]