Abstract
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 Schröinger'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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