噪声场中两能级原子相干特性研究  

Coherence Properties of a Two-level Atom in Noise Field

作　　者：张登玉[1] 

机构地区：[1]湖南衡阳师范学院物理系,衡阳421008

出　　处：《量子电子学报》2003年第4期454-458,共5页Chinese Journal of Quantum Electronics

基　　金：湖南省科技厅中青年科技基金(00JZY2136)

摘　　要：两能级原子置于噪声场中,噪声场用热库态描述.得出原子与噪声场相互作用过程中原子约化密度算符非对角元,讨论原子相干性的衰变.如果在相互作用系统中外加驱动场,当外加驱动场的时间演化满足一定条件时,可保持原子的相干性.A two-level atom is put in noise field, which is described as thermal reservoir. The interaction of atom with noise field is considered. The non-opposite angle element of two-level atom's reducible density mafvix is obtained and decoherence of two-level atom is studied. We discuss atom's decoherence through an external controllable driving field. And the properties of an external driving field are obtained when atom's coherence is maintained.

关 键 词：噪声场 两能级原子 相干性 外加驱动场 量子力学 约化密度算符 

分 类 号：O431.2[机械工程—光学工程]