Dynamics of quantum discord for a two-qubit system

Xiong Yang; Jia-hua Xiao

doi:10.1007/s11801-013-2289-y

Optoelectronics Letters ›› 2013, Vol. 9 ›› Issue (1) : 69-72. DOI: 10.1007/s11801-013-2289-y

Article

Dynamics of quantum discord for a two-qubit system

Xiong Yang¹^,^a ,
Jia-hua Xiao¹

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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.

Keywords

Entangle State / Quantum Correlation / Quantum Discord / Classical Correlation / Open Quantum System

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Xiong Yang, Jia-hua Xiao. Dynamics of quantum discord for a two-qubit system. Optoelectronics Letters, 2013, 9(1): 69‒72 https://doi.org/10.1007/s11801-013-2289-y

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This work has been supported by the Natural Science Foundation of Hunan Province (No.12JJ6002), and the Science and Technology Plan of Hunan Province (No.2012FJ3087).