科研之友
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摘要
The effect of decoherence from a spin environment on quantum discord of two-qubit states is investigated. Our results imply that the dynamics of quantum discord depend not only on the white noise in the Werner state, the coupling strength, and the number of the freedom degrees of the environment but also on the tunneling elements of the environment and the initial state of the environment. By a comparison, we find that the quantum discord for some unentangled states is not zero when the effect of the white noise on the quantum discord and entanglement is considered. With regard to the effect of other factors on the quantum discord and entanglement, we find that both of the quantum discord and entanglement take similar behaviors to a large extent.
