与库相互作用的非耦合的两比特系统的量子失协动力学

J4 ›› 2012, Vol. 29 ›› Issue (3): 323-329.

与库相互作用的非耦合的两比特系统的量子失协动力学

王小云丁邦福赵鹤平

吉首大学物理科学与信息工程学院，湖南吉首 416000

收稿日期:2011-04-25 修回日期:2011-05-15 出版日期:2012-05-28 发布日期:2012-05-22
通讯作者: 王小云（1975-），女，土家族，湖南吉首人，副教授，硕士生导师，主要从事纳米量子光学相关的实验研究。 E-mail:wxyyun@163.com
基金资助:
湖南省自然科学基金 (09JJ6011)，湖南省教育厅资助项目 (10A100和07C528)

Quantum discord dynamics of non-coupled two-qubit system interacting with reservoirs

WANG Xiao-yun, DIND Bang-fu，ZHAO He-ping

College of Physical Science and Information Engineering, Jishou University, Jishou 416000, China

Received:2011-04-25 Revised:2011-05-15 Published:2012-05-28 Online:2012-05-22

摘要/Abstract

摘要：

推导出一个关于结构密度矩阵的量子失协的表达式。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的系统的动力学的精确解，然后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。

关键词: 量子光学, 量子失协, 非马尔科夫主方程, 相干函数

Abstract:

A general expression of quantum discord for structure density matrix was derived. Then, 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 structure density matrix, and we further confirm 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 which kind of master equation used in different coupling areas.

Key words: quantum optics, quantum discord, non-Markovian master equation, correlation function

中图分类号:

O431.2

王小云丁邦福赵鹤平. 与库相互作用的非耦合的两比特系统的量子失协动力学[J]. J4, 2012, 29(3): 323-329.

WANG Xiao-yun, DIND Bang-fu，ZHAO He-ping. Quantum discord dynamics of non-coupled two-qubit system interacting with reservoirs[J]. J4, 2012, 29(3): 323-329.

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