Perturbation Theory for Open Two-Level Nonlinear Quantum Systems  

作　　者：张志杰 姜东光 王伟 

机构地区：[1]School of Physics and Optoelectronic Technology,Dalian University of Technology

出　　处：《Communications in Theoretical Physics》2011年第7期67-70,共4页理论物理通讯（英文版）

基　　金：Supported by National Natural Science Foundation of China under Grant No. 61078011

摘　　要：Perturbation theory is an important tool in quantum mechanics. In this paper, we extend the traditional perturbation theory to open nonlinear two-level systems, treating decoherence parameter γ as a perturbation. By this virtue, we give a perturbative solution to the master equation, which describes a nonlinear open quantum system. The results show that for small decoherence rate γ the ratio of the nonlinear rate C to the tunneling coefficient V （i.e., r = O/V） determines the validity of the perturbation theory. For small ratio r, the perturbation theory is valid, otherwise it yields wrong results.

关 键 词：perturbation theory DECOHERENCE nonlinear system 

分 类 号：O413[理学—理论物理]