若干参数对多能级系统粒子数陷俘的影响  

Effects of Some Factors on Trapping Population in Multi-Level System

作　　者：邓乐[1] 王蔚生[1,2] 孙真荣[1] 丁良恩[1] 王祖赓[1] 

机构地区：[1]华东师范大学量子光学开放研究实验室,华东师范大学物理系,上海200062 [2]福州大学电子系

出　　处：《光学学报》2000年第5期577-582,共6页Acta Optica Sinica

基　　金：国家自然科学基金!(197340 0 3)资助项目

摘　　要：运用缀饰态理论研究在外场、真空模耦合作用下多能级系统基于量子干涉效应的粒子数陷俘现象 ,得到了在干涉条件下系统陷俘粒子数的解析表达式 ,揭示出系统初始布居、驱动场拉比频率以及能级间隔等诸因素对粒子数陷俘效应的影响。研究结果表明 ,在特定的初始布居条件下 ,系统总陷俘粒子数对驱动场拉比频率和上能级间隔的依赖关系不总是简单的单调递增 (递减 )函数关系。对于给定的任意系统 ,总陷俘粒子数的最大值可以通过对其解析表达式求极值而得到。Quantum interference in population trapping in a multi- level system,which is coupled by vacuum modes and driven by a coherent field,is studied in view of dressed states. The analytic expression of trapping population under interference conditions is derived.The influences on population trapping of the initial population,the Rabi frequency of the driving field and the spacing between the upper levels are explored. Itis shown that the forms of the total trapping population of all energy- levels under certain initial population condition,de- pending on both the Rabi Frequency of the driving field and the spacing between the upper levels,are notalways the monotonically increasing( or decreasing) functions.The maximum of the total trapping population in a given system can be obtained by calculating the extremal solution of its analytic equations.

关 键 词：量子干涉 粒子数陷俘 多能级系统 量子光学 

分 类 号：O431[机械工程—光学工程]