title: A 24 km fiber-based discretely signaled continuous variable quantum key distribution system.
abstract: We report a continuous variable key distribution system that achieves a final secure key rate of 3.45 kilobits/s over a distance of 24.2 km of optical fiber. The protocol uses discrete signaling and post-selection to improve reconciliation speed and quantifies security by means of quantum state tomography. Polarization multiplexing and a frequency translation scheme permit transmission of a continuous wave local oscillator and suppression of noise from guided acoustic wave Brillouin scattering by more than 27 dB.
authors.affiliation: Georgia Tech Lorraine, Georgia Tech-C.N.R.S., UMI 2958, 2-3 rue Marconi, Metz, France.
authors.forename: Quyen
authors.initials: Q
authors.lastname: Dinh Xuan
authors.forename: Zheshen
authors.initials: Z
authors.lastname: Zhang
authors.forename: Paul L
authors.initials: PL
authors.lastname: Voss
mesh_terms: D016494:Computer Security / Q000295:instrumentation*; D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D055100:Optical Fibers; D011789:Quantum Theory; D012031:Refractometry / Q000295:instrumentation*; D012815:Signal Processing, Computer-Assisted / Q000295:instrumentation*; D013685:Telecommunications / Q000295:instrumentation*