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Chin. Phys. B, 2013, Vol. 22(4): 040304    DOI: 10.1088/1674-1056/22/4/040304
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Quantum discord dynamics of two qubits in the single-mode cavities

Wang Chena, Chen Qing-Hua b
a Department of Physics, Zhejiang University, Hangzhou 310027, China;
b Center for Statistical and Theoretical Condensed Matter Physics, Zhejiang Normal University, Jinhua 321004, China
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      Published:  01 March 2013
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, Chen Qing-Hu Quantum discord dynamics of two qubits in the single-mode cavities 2013 Chin. Phys. B 22 040304

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