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We study the dynamics of quantum and classical correlations in the presence of nondissipative decoherence. We discover a class of initial states for which the quantum correlations, quantified by the quantum discord, are not destroyed by decoherence for times tsymbol: see text, on the other hand, classical correlations do not change in time and only quantum correlations are lost due to the interaction with the environment. Therefore, at the transition time symbol: see text the open system dynamics exhibits a sudden transition from classical to quantum decoherence regime.
Mazzola et al. (Mon,) studied this question.