辐射和单步吸收同时存在的四能级原子相干特性  

The coherence properties of radiation and one-step absorption in four-level atom

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：《商丘师范学院学报》2007年第12期64-70,共7页Journal of Shangqiu Normal University

基　　金：湖南省自然科学基金(06JJ50118);湖南省教育厅重点科研基金(04A006)资助项目

摘　　要：辐射和吸收是光与物质相互作用的主要过程.本文针对四能级原子辐射和单步吸收同时存在的情况,基于量子力学和Kraus算子理论,利用约化密度矩阵方法,得到四能级原子密度矩阵对角元和非对角元演化规律,从而分析量子态相干特性.The radiation and one - step absorption of the four - level atom is studied. Atom＇s motivated state is not stable, it inevitably disintegrate into the lower energy state, which makes the phenomenon of radiation. This paper is on the basis of theories of quantum mechanics and Kraus operator, utilizing the reducible density rectangular method to probe into the transformation of density matrix opposite angles element and non - opposite angles element of the four - level atom, which in the case of the radiation and one - step absorption. The coherence properties of quantum states are analyzed.

关 键 词：四能级原子 辐射 单步吸收 密度矩阵 量子相干 

分 类 号：O431.2[机械工程—光学工程]