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arXiv quant-ph/0208141quant-ph
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非谐势中分子波包的退相干

Decoherence of molecular wave packets in an anharmonic potential

Peter Foldi, Mihaly G. Benedict, Attila Czirjak, Balazs Molnar

摘要:

研究了在谐振子构成的环境影响下非简谐分子波包的时间演化。这些振荡器代表光子或声子模式,并假定处于热平衡。我们的模型明确纳入了这样一个事实,即在非等距光谱的情况下,环境引起的跃迁的速率是不同的每个过渡。借助于与分子振动态有关的维格纳函数,非幺正时间演化被可视化。退相干的时间尺度比耗散的时间尺度短得多,并且产生沿着相应经典粒子的相空间轨道的局域态的混合物。这种行为在很大程度上与耦合强度、环境温度以及初始状态无关。

英文摘要:

The time evolution of anharmonic molecular wave packets is investigated under the influence of the environment consisting of harmonic oscillators. These oscillators represent photon or phonon modes and assumed to be in thermal equilibrium. Our model explicitly incorporates the fact that in the case of a nonequidistant spectrum the rates of the environment induced transitions are different for each transition. The nonunitary time evolution is visualized by the aid of the Wigner function related to the vibrational state of the molecule. The time scale of decoherence is much shorter than that of dissipation, and gives rise to states which are mixtures of localized states along the phase space orbit of the corresponding classical particle. This behavior is to a large extent independent of the coupling strength, the temperature of the environment and also of the initial state.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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