Phys. Rev. A 72, 012336 (2005) [4 pages]Concurrence of quasipure quantum statesReceived 29 July 2004; published 27 July 2005 We derive an analytic approximation for the concurrence of weakly mixed bipartite quantum states—typical objects in state of the art experiments. This approximation is shown to be a lower bound of the concurrence of arbitrary states. © 2005 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.72.012336
DOI:
10.1103/PhysRevA.72.012336
PACS:
03.67.Mn, 03.65.Ud
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