Phys. Rev. A 77, 012117 (2008) [4 pages]Sudden death of entanglement at finite temperatureReceived 31 July 2007; revised 11 January 2008; published 31 January 2008 We consider the decay of quantum entanglement quantified by the concurrence of a pair of two-level systems, each of which is interacting with a reservoir at finite temperature T. For a broad class of initially entangled states, we demonstrate that the system always becomes disentangled in a finite time, i.e., “entanglement sudden death” occurs. This class includes all states which previously had been found to have long-lived entanglement in zero-temperature reservoirs. Our general result is illustrated by an example. © 2008 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.77.012117
DOI:
10.1103/PhysRevA.77.012117
PACS:
03.65.Yz, 03.65.Ud, 42.50.Lc
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