非Jaynes-Cummings模型下二能级系统随时间演化问题的研究(英文)  

A Two-state System With Evolving Process Beyond Jaynes-Cummings Model

作　　者：易征[1] 汪克林[1] 秦敢[1] 

机构地区：[1]中国科学技术大学近代物理系,合肥230026

出　　处：《中国科学技术大学学报》2004年第3期321-327,共7页JUSTC

基　　金：SupportedbyNSFC (No .10 2 310 5 0 )

摘　　要：应用相干态近似方法研究了与单模玻色子耦合的二能级系统 ,计算了该系统下的能量占有几率Pi(t) ,并且在各种不同的条件下与Jaynes Cummings模型计算出的结果进行了比较 .通过比较得出 :当J C模型已经不再适合的条件下 ,相干态近似方法仍可以用于处理二能级系统 .当考虑到占有几率Pi(t)的微分效应时 ,相干近似方法能够提供更好的近似结果 .相干态近似方法是一种非微扰的非变分的近似方法 。The two-level system interacting with a single-mode boson is studied using the method of coherent approximation. We calculated the occupation probability P i(t) of the system, and compare it with the results of Jaynes-Cummings model under different situations. The results show that this method can be used to deal with the problems when J-C model is not valid. CA(coherent approximation) method can provide better approximate results when the differential physical effect of P i(t) is considered. CA is a non-variational and non-perturbational method that provides a systematic scheme to improve the approximation of the system.

关 键 词：二能级系统 Jaynes—Cummings模型 相干近似方法 

分 类 号：O431.2[机械工程—光学工程] O562.1[理学—光学]