Quantum discord dynamics of two qubits in single-mode cavities |
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| Authors: | Wang Chen a and Chen Qing-Hu |
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| Affiliation: | Wang Chen a) and Chen Qing-Hu a) 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 |
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| Abstract: | The dynamics of quantum discord for two identical qubits in 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 behavior 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. |
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| Keywords: | quantum information cavity quantum electrodynamics entanglement and quantum nonlocality |
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