Phys. Rev. Lett. 95, 040504 (2005) [4 pages]Concurrence of Arbitrary Dimensional Bipartite Quantum StatesReceived 5 April 2005; published 22 July 2005 We derive an analytical lower bound for the concurrence of a bipartite quantum state in arbitrary dimension. A functional relation is established relating concurrence, the Peres-Horodecki criterion, and the realignment criterion. We demonstrate that our bound is exact for some mixed quantum states. The significance of our method is illustrated by giving a quantitative evaluation of entanglement for many bound entangled states, some of which fail to be identified by the usual concurrence estimation method. © 2005 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.95.040504
DOI:
10.1103/PhysRevLett.95.040504
PACS:
03.67.Mn, 03.65.Ud, 89.70.+c
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