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arXiv 2201.03778quant-ph
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关于Caldeira-Leggett形式主义中一些尚未探索的退相干问题:到达时间分布、全同粒子和时间衍射

On some unexplored decoherence aspects in the Caldeira-Leggett formalism: arrival time distributions, identical particles and diffraction in time

S. V. Mousavi, S. Miret-Artes

摘要:

对Caldeira-Leggett主方程中一些尚未探索的退相干问题进行了分析和讨论。退相干过程由两个环境参数控制,即弛豫速率或摩擦和温度,导致从量子到经典的逐渐过渡。到达时间分布,非最小不确定性产品或拉伸高斯波包,全同粒子和衍射的时间显示有趣的功能在退相干过程中经历的时间相关的干涉图案。结果表明,在考虑开放动力学时,常力场的存在不影响退相干,拉伸参数的{ \it正值}减小退相干速率,全同粒子的波函数对称性不起作用;并且在时间和空间上的衍射通过在零耗散极限内增加温度和/或弛豫速率而逐渐消除。叫做量子快门问题

英文摘要:

Some unexplored decoherence aspects within the Caldeira-Leggett master equation are analyzed and discussed. The decoherence process is controlled by the two environment parameters, the relaxation rate or friction and the temperature, leading to a gradual transition from the quantum to classical regime. Arrival time distributions, nonminimum-uncertainty-product or stretching Gaussian wave packets, identical particles and diffraction in time display interesting features during the decoherence process undergone by the time dependent interference patterns. We show that the presence of a constant force field does not affect the decoherence, {\it positive} values of the stretching parameter reduces the rate of decoherence, the symmetry of the wave function for identical particles plays no role when open dynamics are considered; and diffraction in time and space is gradually washed out by increasing the temperature and/or relaxation rate in the zero dissipation limit within the so-called quantum shutter problem.

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