Lower bound of concurrence based on positive maps
Xiaosheng Li, Xiu-Hong Gao, Shao-Ming Fei · Physical Review A · 2011
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 positive partial transposition, realignment criteria, and Breuer's entanglement witness.