Quantum discord dynamics in the presence of initial system-cavity correlations

被引：20

作者：

Zhang, Ying-Jie ^{[1
]}

Zou, Xu-Bo ^{[2
]}

Xia, Yun-Jie ^{[1
]}

Guo, Guang-Can ^{[2
]}

机构：

[1] Qufu Normal Univ, Shandong Prov Key Lab Laser Polarizat & Informat, Dept Phys, Qufu 273165, Peoples R China

[2] Univ Sci & Technol China, Key Lab Quantum Informat, Dept Phys, Hefei 230026, Peoples R China

来源：

JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS | 2011年 / 44卷 / 03期

基金：

中国国家自然科学基金;

关键词：

NEED; DECAY;

D O I：

10.1088/0953-4075/44/3/035503

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We analyse the roles of initial correlations between a two-qubit system and a dissipative cavity on quantum discord dynamics of two qubits. Considering two initial system-cavity states, we find that the initial system-cavity correlations not only initially increase the two-qubit quantum discord but also lead to a larger long-time quantum discord asymptotic value. Moreover, quantum discord due to initial correlations is more robust than the case of the initial factorized state. Finally, we show the initial correlations' importance for dynamic behaviour of mutual information and classical correlation.

引用

页数：5

共 31 条

[1] REDUCED DYNAMICS NEED NOT BE COMPLETELY POSITIVE - COMMENTS [J].