Quantum discord dynamics of two qubits in the single-mode cavities

doi:10.1088/1674-1056/22/4/040304

Abstract The dynamics of the quantum discord for two identical qubits in both two independent single-mode cavities and a common single-mode cavity are discussed. For the initial Bell state with correlated spins, while the entanglement sudden death can occur, the quantum discord vanishes only at discrete moments in the independent cavities and never vanishes in the common cavity. Interestingly, quantum discord and entanglement show opposite behaviors in the common cavity, unlike in the independent cavities. For the initial Bell state with anti-correlated spins, quantum discord and entanglement behave in the same way for both independent cavities and a common cavity. It is found that the detunings always stabilize the quantum discord.

Keywords: quantum information cavity quantum electrodynamics entanglement and quantum nonlocality

Received: 05 September 2012
Revised: 10 October 2012
Accepted manuscript online:

PACS:	03.67.-a	(Quantum information)
	42.50.Pq	(Cavity quantum electrodynamics; micromasers)
	03.65.Ud	(Entanglement and quantum nonlocality)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 11174254) and the National Basic Research Program of China (Grant Nos. 2011CBA00103 and 2009CB929104).

Corresponding Authors: Chen Qing-Hu
E-mail: qhchen@zju.edu.cn

Cite this article:

Wang Chen (王晨), Chen Qing-Hu (陈庆虎) Quantum discord dynamics of two qubits in the single-mode cavities 2013 Chin. Phys. B 22 040304

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Quantum discord dynamics of two qubits in the single-mode cavities

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