Lower Bound of Concurrence Based on Positive Maps
Xiao-Sheng Li, Xiu-Hong Gao,and Shao-Ming Fei
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Submission date: 03. Sep. 2011
published in: Physical review / A, 83 (2011) 3, p. 034303
DOI number (of the published article): 10.1103/PhysRevA.83.034303
PACS-Numbers: 03.67.Mn, 03.67.-a, 02.20.Hj, 03.65.-w
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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.