A lower bound of concurrence for multipartite quantum states
Ming Li, Shao-Ming Fei, Zhi‐Xi Wang · Journal of Physics A Mathematical and Theoretical · 2009
We study the concurrence of arbitrary multipartite mixed quantum states. An explicit lower bound of the concurrence is derived, which detects quantum entanglement of some states better than some separability criteria, and gives sufficient conditions for distilling GHZ states from tripartite states. An interesting relation between the lower bound of the concurrence for bipartite states and for tripartite states has been presented.