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

Jérôme Lodewyck, Matthieu Bloch, Raul Garcia-Patron Sanchez, Simon Fossier, Evgueni Karpov, Eleni Diamanti, Thierry Debuisschert, Nicolas J. Cerf, Rosa Tualle-Brouri, Steven W. McLaughlin, Philippe Grangier

Research output: Contribution to journalArticlepeer-review


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 opticalfiber. Time multiplexing is used to transmit both the signal and phase reference in the same optical fiber. Oursystem includes all experimental aspects required for a field implementation of a quantum key distributionsetup. Real-time reverse reconciliation is achieved by using fast and efficient low-density parity check errorcorrecting codes.
Original languageEnglish
Article number042305
Number of pages10
JournalPhysical Review A
Issue number4
Publication statusPublished - 3 Oct 2007

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