title: Concurrence of arbitrary dimensional bipartite quantum states.
abstract: 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.
authors.affiliation: Institut für Angewandte Mathematik, Universität Bonn, Germany.
authors.forename: Kai
authors.initials: K
authors.lastname: Chen
authors.forename: Sergio
authors.initials: S
authors.lastname: Albeverio
authors.forename: Shao-Ming
authors.initials: SM
authors.lastname: Fei