Lower Bound of Concurrence Based on Positive Maps

Published 6 Apr 2011 in quant-ph | (1104.1000v1)

Abstract: We study the concurrence of arbitrary dimensional bipartite quantum systems. An explicit analytical lower bound of concurrence is obtained, which detects entanglement for some quantum states better than some well-known separability criteria, and improves the lower bounds such as from the PPT, realignment criteria and the Breuer's entanglement witness.

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