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Sudden Death of Entanglement
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A new development in the dynamical behavior of elementary quantum systems is the surprising discovery that correlation between two quantum units of information called qubits can be degraded by environmental noise in a way not seen previously in studies of dissipation. This new route for dissipation attacks quantum entanglement, the essential resource for quantum information as well as the central feature in the Einstein-Podolsky-Rosen so-called paradox and in discussions of the fate of Schr\"{o}inger's cat. The effect has been labeled ESD, which stands for early-stage disentanglement or, more frequently, entanglement sudden death. We review recent progress in studies focused on this phenomenon.
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Local-available quantum correlation swapping in one-parameter X states
LAQC can be redistributed by projective swapping in X states, but the paper's key examples claiming separable final states with nonzero LAQC are only valid for part of the parameter space.
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