摘要
推导出一个关于X结构密度矩阵的量子失协表达式。在单一激发下,给出两个非耦合的量子比特分别与库相互作用构成系统的动力学的精确解,用非马尔科夫主方程方法精确求解了这个系统的耗散动力学。在失谐光谱密度下,讨论和比较不同耦合区域内系统的量子失协动力学特征。结果表明:量子失协表达式适用于任意有X型密度矩阵的物理系统,在失谐光谱密度下,证实两类主方程分别适用于不同的耦合区域。这将为以后更加简便地计算量子失协,以及在不同的耦合区域运用哪一类主方程提供一定的参考依据。
A general expression of quantum discord for X structure density matrix was derived. The dissipative dynamics of non-coupled two qubits independently interacting with their reservoir was solved by the non-Markovian master equation in a single excitation state. Under the detuning spectral density, the quantum discord dynamics was discussed and compared in different coupling regime. The results showed that this expression was employed to any physical system having X structure density matrix, and the two variants of master equations were exploited in different coupled regimes in the description of quantum correlation dynamics. It is convenient to calculate the quantum discord for later study and provide certain reference about what kind of master equation used in different coupling areas.
出处
《量子电子学报》
CAS
CSCD
北大核心
2012年第3期323-329,共7页
Chinese Journal of Quantum Electronics
基金
湖南省自然科学基金(09JJ6011)
湖南省教育厅资助项目(10A100
07C528)
关键词
量子光学
量子失协
非马尔科夫主方程
关联函数
quantum optics
quantum discord
non-Markovian master equation
correlation function
