title: Superactivation of bound entanglement.
abstract: We show that, in a multiparty setting, two nondistillable (bound-entangled) states tensored together can make a distillable state. This is an example of true superadditivity of distillable entanglement. We also show that unlockable bound-entangled states cannot be asymptotically unentangled, providing the first proof that some states are truly bound-entangled in the sense of being both nondistillable and nonseparable asymptotically.
authors.affiliation: AT&T Labs-Research, Florham Park, New Jersey 07932, USA.
authors.forename: Peter W
authors.initials: PW
authors.lastname: Shor
authors.forename: John A
authors.initials: JA
authors.lastname: Smolin
authors.forename: Ashish V
authors.initials: AV
authors.lastname: Thapliyal