title: Distribution of time-bin entangled qubits over 50 km of optical fiber.
abstract: We report experimental distribution of time-bin entangled qubits over 50 km of optical fibers. Using actively stabilized preparation and measurement devices we demonstrate violation of the Clauser-Horne-Shimony-Holt Bell inequality by more than 15 standard deviations without removing the detector noise. In addition we report a proof-of principle experiment of quantum key distribution over 50 km of optical fibers using entangled photon.
authors.affiliation: Group of Applied Physics-Optique, University of Geneva, CH-1211 Geneva 4, Switzerland.
authors.forename: I
authors.initials: I
authors.lastname: Marcikic
authors.forename: H
authors.initials: H
authors.lastname: de Riedmatten
authors.forename: W
authors.initials: W
authors.lastname: Tittel
authors.forename: H
authors.initials: H
authors.lastname: Zbinden
authors.forename: M
authors.initials: M
authors.lastname: Legré
authors.forename: N
authors.initials: N
authors.lastname: Gisin