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The structures of state space concerning quantum dynamical semigroups

机译:关于量子动力学半群的状态空间结构

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Each semigroup describing time evolution of an open quantum system on a finite dimensional Hilbert space is related to a special structure of this space. It is shown how the space can be decomposed into orthogonal subspaces: One part is related to decay, some subspaces of the other subspace are ranges of the stationary states. Specialities are highlighted where the complete positivity of evolutions is actually needed for analysis, mainly for evolution of coherence. Decompositions are done the same way for discrete as for continuous time evolutions, but they may show differences: Only for discrete semigroups there may appear cases of sudden decay and of perpetual oscillation. Concluding the analysis, we identify the relation of the state space structure to the processes of decay, decoherence, dissipation and dephasing.
机译:每个描述有限量子希尔伯特空间上的开放量子系统的时间演化的半群都与该空间的特殊结构有关。展示了如何将空间分解为正交子空间:一个部分与衰减有关,其他子空间的一些子空间是稳态的范围。突出强调了专业,在这些专业中,实际上需要演化的完全正性来进行分析,主要是为了进行连贯性的演化。分解的方式与离散的方式和连续的时间演化方式相同,但它们可能显示出差异:仅对于离散的半群,可能会出现突然衰减和永久振荡的情况。总结分析,我们确定了状态空间结构与衰减,退相干,耗散和移相过程的关系。

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