title: Optimality of Gaussian attacks in continuous-variable quantum cryptography.
abstract: We analyze the asymptotic security of the family of Gaussian modulated quantum key distribution protocols for continuous-variables systems. We prove that the Gaussian unitary attack is optimal for all the considered bounds on the key rate when the first and second momenta of the canonical variables involved are known by the honest parties.
authors.affiliation: ICFO-Institut de Ciencies Fotoniques, Mediterranean Technology Park, 08860 Castelldefels (Barcelona), Spain.
authors.forename: Miguel
authors.initials: M
authors.lastname: Navascués
authors.forename: Frédéric
authors.initials: F
authors.lastname: Grosshans
authors.forename: Antonio
authors.initials: A
authors.lastname: Acín