title: Entanglement and permutational symmetry.
abstract: We study the separability of permutationally symmetric quantum states. We show that for bipartite symmetric systems most of the relevant entanglement criteria coincide. However, we provide a method to generate examples of bound entangled states in symmetric systems, for the bipartite and the multipartite case. These states shed some new light on the nature of bound entanglement.
authors.affiliation: Department of Theoretical Physics, The University of the Basque Country, P.O. Box 644, E-48080 Bilbao, Spain.
authors.forename: Géza
authors.initials: G
authors.lastname: Tóth
authors.forename: Otfried
authors.initials: O
authors.lastname: Gühne