耗散腔中两二能级原子态的量子信息保真度  

Fidelity a pair of two-level atoms' quantum states in the dissipative cavity

作　　者：刘万芳[1,2] 严冬[3] 王晓光[2] 

机构地区：[1]安庆师范学院物理与电气工程学院,安庆246011 [2]浙江大学近代物理中心,杭州310027 [3]长春大学应用物理系,长春130022

出　　处：《原子与分子物理学报》2008年第5期1205-1210,共6页Journal of Atomic and Molecular Physics

基　　金：安庆师范学院科研启动资金(044-K05000000060);国家自然科学基金(10405019)

摘　　要：在能量耗散腔中,原子用泡利算符描述,光场用相干态描述,运用密度矩阵理论,得到了两二能级原子密度矩阵元的演化规律,针对不同的初态,分析与单模辐射场作用过程中原子态的量子信息保真度.结果表明:当两原子初始处于不同的量子态时,量子信息在传输过程中可能不失真或部分失真,也可能出现周期性演化;在输出态和输入态具有相同的纠缠度时,量子信息可能不失真,也可能完全失真.In this paper, the two-level atom is described by Pauli sign and the optical field is described by coherent state. The two-level atoms＇ reducible density rectangular array is obtained using the density matrix theory. We discuss the properties of fidelity of quantum state of two-level atoms interacting with a single-mode field in a dissipative cavity. The results show that for the two-level atoms initially situated in different state, quantum information may not lose fidelity or may partly lose fidelity, and also may evolves periodic during evolution in transmission process, when the entanglement degree of two-level atoms in output state is same with the entanglement degree in input state, quantum information may completely lose fidelity or may not lose fidelity.

关 键 词：二能级原子 单模辐射场 纠缠度 保真度 

分 类 号：O431.2[机械工程—光学工程]