Phys. Rev. A 76, 042305 (2007) [10 pages]Quantum key distribution over 25 km with an all-fiber continuous-variable systemReceived 28 June 2007; published 3 October 2007 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. © 2007 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.76.042305
DOI:
10.1103/PhysRevA.76.042305
PACS:
03.67.Dd, 42.50.Lc, 42.81.−i, 03.67.Mn
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