title: Continuous variable quantum key distribution: finite-key analysis of composable security against coherent attacks.
abstract: We provide a security analysis for continuous variable quantum key distribution protocols based on the transmission of two-mode squeezed vacuum states measured via homodyne detection. We employ a version of the entropic uncertainty relation for smooth entropies to give a lower bound on the number of secret bits which can be extracted from a finite number of runs of the protocol. This bound is valid under general coherent attacks, and gives rise to keys which are composably secure. For comparison, we also give a lower bound valid under the assumption of collective attacks. For both scenarios, we find positive key rates using experimental parameters reachable today.
authors.affiliation: Institut für Theoretische Physik, Leibniz Universität Hannover, Hannover, Germany. fabian.furrer@itp.uni-hannover.de
authors.forename: F
authors.initials: F
authors.lastname: Furrer
authors.forename: T
authors.initials: T
authors.lastname: Franz
authors.forename: M
authors.initials: M
authors.lastname: Berta
authors.forename: A
authors.initials: A
authors.lastname: Leverrier
authors.forename: V B
authors.initials: VB
authors.lastname: Scholz
authors.forename: M
authors.initials: M
authors.lastname: Tomamichel
authors.forename: R F
authors.initials: RF
authors.lastname: Werner