Enhancement of stationary state quantum discord in Tavis-Cummings model by nonlinear Kerr-like medium |
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Authors: | Qi-Liang He |
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Affiliation: | Zhejiang Institute of Modern Physics and Physics Department, Zhejiang University, Hangzhou 310027, PR China |
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Abstract: | We investigate the influence of nonlinear Kerr-like medium and dipole-dipole interaction on the dynamics of quantum discord in Tavis-Cummings model with phase decoherence. We show that in the resonance case (i) atom-field quantum discord rapidly decays with phase decoherence and doesn't exist the stationary state quantum discord, but the stationary state quantum discord appears if we choose the suitable values of Kerr coefficient χ and dipole-dipole interaction Ω, (ii) the quantum discord of two atoms survives in the stationary state and the amount of stationary state quantum discord could be improved by adjusting the values of χ and Ω. In the non-resonance case, the arbitrary bipartite quantum discord of the system could not be completely destroyed by the phase decoherence and can be improved by applying nonlinear Kerr-like medium and dipole-dipole interaction. |
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Keywords: | Stationary state quantum discord Cavity QED Nonlinear Kerr-like medium Phase decoherence |
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