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论文类型：期刊论文

发表时间：2011-07-15

发表刊物：COMMUNICATIONS IN THEORETICAL PHYSICS

收录刊物：Scopus、SCIE、ISTIC

卷号：56

期号：1

页面范围：67-70

ISSN号：0253-6102

关键字：perturbation theory; decoherence; nonlinear system

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 gamma 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 gamma, the ratio of the nonlinear rate C to the tunneling coefficient V (i.e., r = C/V) determines the validity of the perturbation theory. For small ratio r, the perturbation theory is valid, otherwise it yields wrong results.