title: Irreversibility in asymptotic manipulations of entanglement.
abstract: We show that the process of entanglement distillation is irreversible by showing that the entanglement cost of a bound entangled state is finite. Such irreversibility remains even if extra pure entanglement is loaned to assist the distillation process.
authors: Institut für Theoretische Physik, Universität Innsbruck, A-6020 Innsbruck, Austria.
authors: G
authors: G
authors: Vidal
authors: J I
authors: JI
authors: Cirac