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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 |
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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.
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Received: 28 July 2013
Revised: 21 August 2013
Accepted manuscript online:
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PACS:
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42.50.Dv
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(Quantum state engineering and measurements)
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Fund: Projects supported by the National Natural Science Foundation of China (Grant No. 11074072). |
Corresponding Authors:
Fang Mao-Fa
E-mail: mffang@hunnu.edu.cn
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Cite this article:
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 2014 Chin. Phys. B 23 034204
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