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Analyses of phenomena exhibiting finite-time decay of quantum entanglementhave recently attracted considerable attention. Such decay is often referred toas sudden vanishing (or sudden death) of entanglement, which can be followed byits sudden reappearance (or sudden rebirth). We analyze various finite-timedecays (for dissipative systems) and analogous periodic vanishings (for unitarysystems) of nonclassical correlations as described by violations of classicalinequalities and the corresponding nonclassicality witnesses (or quantumnesswitnesses), which are not necessarily entanglement witnesses. We show thatthese sudden vanishings are universal phenomena and can be observed: (i) notonly for two- or multi-mode but also for single-mode nonclassical fields, (ii)not solely for dissipative systems, and (iii) at evolution times which areusually different from those of sudden vanishings and reappearances of quantumentanglement.

physical review. a, atomic, molecular, and optical physics/physical review, a, atomic, molecular, and optical physics

Sudden vanishing and reappearance of nonclassical effects: General  occurrence of finite-time decays and periodic vanishings of nonclassicality  and entanglement witnesses