电控量子点分子的时域量子关联退相干

Decoherence of temporal quantum correlation in electrically controllable quantum-dots molecules

本文以与光腔耦合的电控量子点分子为研究对象,分析了量子点的时域量子关联退相干特性。基于可测量的Leg-gett-Garg不等式,研究光电混合系统的时域量子关联。测量不等式的违背性可以作为动态演化过程中时域量子关联的存在证据。调控电子隧穿强度和光腔频率失谐有利于增强时域量子关联。发现,在空间量子关联值为零的区域内,不存在时域量子关联。当空间量子关联值较高时,量子点动力学演化存在Leggett-Garg不等式测量的最大程度违背现象。与之相反,在时域量子关联为零的时间段内,空间量子关联仍然存在。本文采用开放量子系统动力学方法研究环境效应对时域量子关联的影响。量子点的自发衰变和光腔泄漏抑制了时域量子关联。这些结果可用于混合量子系统的量子信息处理技术。

The decoherence of temporal quantum correlation is explored in a voltage-controlled quantum dots molecule coupled to a cavity.The temporal correlation in the optoelectronic hybrid system is studied based on Leggett-Garg inequalities.The inequality violations can be interpreted as the existence of temporal quantum correlation during dynamical evolution.The temporal quantum correlation is enhanced by its electron tunnel’s strength and cavity frequency detuning.It is found that there is no temporal quantum correlation in the regions where the values of spatial quantum correlation are zero and the maximal violations occur in conditions with high values of quantum correlation.In contrast,the spatial quantum coherence can still exsit when the value of temporal quantum correlation is zero.The method of open quantum system dynamic is used to study the effect of reservoir memory on temporal quantum correlation.The temporal quantum correlation can be suppressed due to the spontaneous decay of the quantum dots and cavity leakage.These results are helpful for quantum information processing technology in hybrid quantum systems.