Dynamics of quantum discord for a two-qubit system
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- Xiong Yang
Xiong Yang
Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education, Department of Physics and Information Science, Hunan Normal University, Changsha, 410081, China
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Search for this author on this site - Jia-hua Xiao
Jia-hua Xiao
Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education, Department of Physics and Information Science, Hunan Normal University, Changsha, 410081, China
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Abstract:
We study the dynamics of quantum discord of a two-qubit system coupled to a common structured reservoir at zero temperature. The conditions to maximize reservoir-induced quantum discord for the two-qubit system wiht an initially factorized state are derived. In particular, when the two qubits are placed in a lossy cavity, high values of quantum discord can be obtained in the dispersive regime, even in the bad-cavity limit. Finally, we show that under certain conditions, the quantum discord dynamics exhibits quantum beats.
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Xiong Yang, Jia-hua Xiao. Dynamics of quantum discord for a two-qubit system[J]. Optoelectronics Letters,2013,9(1):69-72
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