title: Gaussian transformations and distillation of entangled Gaussian states.
abstract: We prove that it is impossible to distill more entanglement from a single copy of a two-mode bipartite entangled Gaussian state via local Gaussian operations and classical communication. More generally, we show that any hypothetical distillation protocol for Gaussian states involving only Gaussian operations would be a deterministic protocol. Finally, we argue that the protocol considered by Eisert et al. [preceding Letter, Phys. Rev. Lett. 89, 137903 ()]] is the optimum Gaussian distillation protocol for two copies of entangled Gaussian states.
authors.affiliation: Department of Optics, Palacký University, 17. listopadu 50, 77200 Olomouc, Czech Republic.
authors.forename: Jaromír
authors.initials: J
authors.lastname: Fiurásek