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

doi:10.1088/1674-1056/23/3/034204

中国物理B ›› 2014, Vol. 23 ›› Issue (3): 34204-034204.doi: 10.1088/1674-1056/23/3/034204

• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇下一篇

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

郭有能, 方卯发, 刘翔, 杨百元

Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education, Department of Physics, Hunan Normal University, Changsha 410081, China

收稿日期:2013-07-28 修回日期:2013-08-21 出版日期:2014-03-15 发布日期:2014-03-15
基金资助:
Projects supported by the National Natural Science Foundation of China (Grant No. 11074072).

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

Guo You-Neng (郭有能), Fang Mao-Fa (方卯发), Liu Xiang (刘翔), Yang Bai-Yuan (杨百元)

Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education, Department of Physics, Hunan Normal University, Changsha 410081, China

Received:2013-07-28 Revised:2013-08-21 Online:2014-03-15 Published:2014-03-15
Contact: Fang Mao-Fa E-mail:mffang@hunnu.edu.cn
Supported by:
Projects supported by the National Natural Science Foundation of China (Grant No. 11074072).

摘要/Abstract

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.

关键词: quantum discord, non-Markovian region, classical noise

Abstract: 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.

Key words: quantum discord, non-Markovian region, classical noise

中图分类号: (Quantum state engineering and measurements)

42.50.Dv

郭有能, 方卯发, 刘翔, 杨百元. Dynamics of quantum discord in a two-qubit system under classical noise[J]. 中国物理B, 2014, 23(3): 34204-034204.

Guo You-Neng (郭有能), Fang Mao-Fa (方卯发), Liu Xiang (刘翔), Yang Bai-Yuan (杨百元). Dynamics of quantum discord in a two-qubit system under classical noise[J]. Chin. Phys. B, 2014, 23(3): 34204-034204.

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

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

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