title: Distillability via protocols respecting the positivity of partial transpose.
abstract: We show that all quantum states that do not have a positive partial transpose are distillable via channels, which preserve the positivity of the partial transpose. The question whether bound entangled states with non-positive partial transpose exist is therefore closely related to the connection between the set of separable superoperators and positive partial transpose-preserving maps.
authors.affiliation: Institut für Mathematische Physik, TU Braunschweig, Mendelssohnstrasse 3, 38106 Braunschweig, Germany. T.Eggeling@tu-bs.de
authors.forename: T
authors.initials: T
authors.lastname: Eggeling
authors.forename: K G
authors.initials: KG
authors.lastname: Vollbrecht
authors.forename: R F
authors.initials: RF
authors.lastname: Werner
authors.forename: M M
authors.initials: MM
authors.lastname: Wolf