title: Entanglement of formation of bipartite quantum states.
abstract: We give an explicit tight lower bound for the entanglement of formation for arbitrary bipartite mixed states by using the convex hull construction of a certain function. This is achieved by revealing a novel connection among the entanglement of formation, the well-known Peres-Horodecki, and realignment criteria. The bound gives a quite simple and efficiently computable way to evaluate quantitatively the degree of entanglement for any bipartite quantum state.
authors.affiliation: Institut für Angewandte Mathematik, Universität Bonn, D-53115, 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