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 LDPC error correcting codes.
@article{arxiv.0706.4255,
title = {Quantum key distribution over 25 km with an all-fiber continuous-variable system},
author = {Jerome Lodewyck and Matthieu Bloch and Raul Garcia-Patron and Simon Fossier and Evgueni Karpov and Eleni Diamanti and Thierry Debuisschert and Nicolas J. Cerf and Rosa Tualle-Brouri and Steven W. McLaughlin and Philippe Grangier},
journal= {arXiv preprint arXiv:0706.4255},
year = {2008}
}