Dynamics of quantum discord in a two-qubit system under classical noise

被引：0

作者：

郭有能 ^{[1
]}

方卯发 ^{[1
]}

刘翔 ^{[1
]}

杨百元 ^{[1
]}

机构：

[1] Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education,Department of Physics, Hunan Normal University

来源：

Chinese Physics B | 2014年 / 23卷 / 03期

基金：

中国国家自然科学基金;

关键词：

quantum discord; non-Markovian region; classical noise;

D O I：

暂无

中图分类号：

O413.1 [量子力学（波动力学、矩阵力学）];

学科分类号：

070205 ; 0809 ;

摘要：

We study the quantum discord dynamics of two noninteracting qubits that are, respectively, subject to classical noise.The results show that the dynamics of quantum discord are dependent on both the coupling between the qubits and classical noise, and the average switching rate of the classical noise. In the weak-coupling Markovian region, quantum discord exhibits exponent decay without revival, and can be well protected by increasing the average classical noise switching rate. While in the strong-coupling non-Markovian region, quantum discord reveals slowly decayed oscillations with quick revival by decreasing the average switching rate of the classical noise. Thus, our results provide a new method of protecting quantum discord in a two-qubit system by controlling the coupling between the qubits and classical noise, and the average switching rate of the classical noise.

引用

页码：278 / 281

页数：4

共 3 条

[1] Robustness of quantum discord to sudden death in nuclear magnetic resonance[J] . Xu Jian-Wei,Chen Qi-Hui. Chinese Physics B . 2012 (4)
[2] Quantum Discord Dynamics in Two Different Non-Markovian Reservoirs
Ding Bang-Fu
Wang Xiao-Yun
Liu Jing-Feng
Yan Lin
Zhao He-Ping
[J]. CHINESE PHYSICS LETTERS, 2011, 28 (10)
[3] Disentanglement and decoherence from classical non-Markovian noise: random telegraph noise[J] . Dong Zhou,Alex Lang,Robert Joynt. Quantum Information Processing . 2010 (6)

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