二能级系统光子回波在缀饰态表象中的动态分析  

Dynamic analysis of the two-level system photon echo in the dressed state representation

作　　者：张艳丽[1] 仇旭[1] 李永放[1] 

机构地区：[1]陕西师范大学物理学与信息技术学院

出　　处：《陕西师范大学学报（自然科学版）》2007年第3期35-39,共5页Journal of Shaanxi Normal University：Natural Science Edition

基　　金：陕西省自然科学基金资助项目(2003A08)

摘　　要：采用布洛赫矢量方法,从量子干涉角度,用缀饰态理论对二能级系统光子回波机理进行了分析,清晰地给出了光与原子相互作用过程的物理描述.探讨了绝热条件下光子回波技术对量子信息存储和信息提取的动态过程.结果表明,二能级跃迁第一个脉冲将信息写入介质,第二个脉冲为信息读出提供条件,让布洛赫矢量的v、w分量反转,此后写入的信息以光子回波的形式再现,即光子回波实质是光信息的写入和读出过程.Using the method of the Bloch vectors, the physics mechanism of the photon echo is analyzed with both the dressed state and quantum interference theory, and the physics picture for the interaction between light and atoms is given in detail. The dynamic process for the quantum information storage and that of the recall with the photon echo is discussed under adiabatic condition. The results show that the photon information is stored in the medium during the first pulse, and when v and w of the Bloch vectors are inversed during the second pulse, the information reappears as the photon echo. The process of the photon echo is virtually the process of photon information storage and recall.

关 键 词：缀饰态理论 绝热条件 布洛赫矢量 

分 类 号：O431.2[机械工程—光学工程]