Emergence of decoherence by incoherent manifestation of coherent quantum fluctuations
Emergence of decoherence by incoherent manifestation of coherent quantum fluctuations
复制标题
相干量子涨落的不相干表现导致退相干的出现
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
Murat Çetinbas
中科院分区：
文献类型：
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作者：
Murat Çetinbas
量子系统与其周围环境的相互作用由于退相干过程而导致系统状态中的量子关联的损失。通常认为退相干的起因是系统与环境的纠缠，但这并不是退相干的唯一来源。在这里，我们表明，环境引起的相干量子涨落，即兰姆或斯塔克移位的影响，也可以导致退相干的出现，我们称之为非相干过程，即使在没有系统环境纠缠。我们从一般的退相干动力学中分离出非相干过程，并在没有纠缠诱导的退相干的情况下，制定了控制非相干动力学的精确运动方程。我们研究了一些不同情况下的非相干动力学，包括混沌、规则和无消相干环境。
The interaction of a quantum system with its surrounding environment results in losses of quantum correlations in the state of the system due to a decoherence process. The origin of decoherence is often attributed to the system–environment entanglement, which is not the only source of decoherence, however. Here we show that environment-induced coherent quantum fluctuations, i.e. Lamb or Stark shift-like effects, can also lead to the emergence of decoherence, which we call an incoherence process, even in the absence of the system–environment entanglement. We isolate the incoherence process from a general decoherence dynamics and formulate the exact equation of motion governing the incoherence dynamics in the absence of entanglement-induced decoherence. We exemplify the incoherence dynamics for a number of different situations including chaotic, regular and decoherence-free environments.