Quantum key distribution device with coherent states
Jérôme Lodewyck, Matthieu R. Bloch, Raúl García−Patrón, Simon Fossier, Evgueni Karpov, Eleni Diamanti, Thierry Debuisschert, Nicolas J. Cerf, Rosa Tualle-Brouri, Stephen McLaughlin, Philippe Grangier · Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 2007
We report on both theoretical and experimental aspects of a fully implemented quantum key distribution device with coherent states. This system features a final key rate of more than 2 kb/s over 25 km of optical fiber. It comprises all required elements for field operation: a compact optical setup, a fast secret bit extraction using efficient LDPC codes, privacy amplification algorithms and a classical channel software. Both hardware and software are operated in real time.