title: Concurrence of mixed bipartite quantum states in arbitrary dimensions.
abstract: We derive a lower bound for the concurrence of mixed bipartite quantum states, valid in arbitrary dimensions. As a corollary, a weaker, purely algebraic estimate is found, which detects mixed entangled states with a positive partial transpose.
authors.affiliation: Max-Planck-Institut für Physik Komplexer Systeme, Nöthnitzerstrasse 38, D-01187 Dresden, Germany.
authors.forename: Florian
authors.initials: F
authors.lastname: Mintert
authors.forename: Marek
authors.initials: M
authors.lastname: Kuś
authors.forename: Andreas
authors.initials: A
authors.lastname: Buchleitner