Quantum key distribution over 25 km with an all-fiber continuous-variable system

Journal Article · Mon Oct 15 04:00:00 EDT 2007 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.76.042305· OSTI ID:21020674

Lodewyck, Jerome; Fossier, Simon ^[1]; Bloch, Matthieu; McLaughlin, Steven W ^[2]; Garcia-Patron, Raul; Karpov, Evgueni; Cerf, Nicolas J ^[3]; Diamanti, Eleni; Tualle-Brouri, Rosa; Grangier, Philippe ^[4]; Debuisschert, Thierry ^[1]

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1. Thales Research and Technologies, RD 128, 91767 Palaiseau Cedex (France)
2. GeorgiaTech-CNRS UMI 2958, 2-3 rue Marconi, 57070 Metz (France)
3. Centre for Quantum Information and Communication, Ecole Polytechnique, CP 165/59, Universite libre de Bruxelles, 50 av. F. D. Roosevelt, B-1050 Brussels (Belgium)
4. Laboratoire Charles Fabry de l'Institut d'Optique-CNRS-Universite Paris-Sud, Campus Polytechnique, RD 128, 91127 Palaiseau Cedex (France)

We report on the implementation of a reverse-reconciliated coherent-state continuous-variable quantum key distribution system, with which we generated secret keys at a rate of more than 2 kb/s over 25 km of optical fiber. Time multiplexing is used to transmit both the signal and phase reference in the same optical fiber. Our system includes all experimental aspects required for a field implementation of a quantum key distribution setup. Real-time reverse reconciliation is achieved by using fast and efficient low-density parity check error correcting codes.

• OSTI ID: 21020674
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 4 Vol. 76; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
COHERENT PRODUCTION
EIGENSTATES
ERRORS
OPTICAL FIBERS
QUANTUM CRYPTOGRAPHY
QUANTUM MECHANICS
SIGNALS