摘要
利用Born－Oppenheimer近似研究了零温时耗散两态系统的动力学特性．在不同环境谱分布下，给出了两态之间的跃迁几率随时间的变化．数值结果表明：当环境的谱分布为Ohmic形式时，跃迁几率是一个衰减的函数；而当谱分布为随机取值时，跃迁几率具有“量子跳跃”的特性．与之相对比，我们还给出了当把环境等价成无穷多个谱振子的集合时，跃迁几率随时间的变化．
Based on the Born-Oppenheimer approximation,the zero-temperature dynamics of the two-state system is studied in this paper. Treating the bath as bosons,the transition probability iS givenand discussed for various spectral distribution of the reservoir. As a result of computer siinulation,thetransition probability displays a .damped oscillation function of time, when the spectral distrubutiontakes so-called the Ohmic form with a cut-off mp,whereas the quantum jump appears in the transitionprobability when the spectral distribution is random with the same cut - off. For the purpose ofcomparison, the temporal properties of the probability is also derived and discussed for the case inwhich the bath is treated as infinite 0scillators.
出处
《光子学报》
EI
CAS
CSCD
1997年第9期771-776,共6页
Acta Photonica Sinica
基金
吉林省科委青年研究基金
关键词
耗散两态系统
B-O近似
量子跃迁
Dissipative two-state system
B-O approximation
Quantum jump
