Quantum key distribution over 25 km using a fibre set-up based on continuous variables J. Lodewyck, M. Bloch, S. Fossier, E. Diamanti, T. Debuisschert, R. Tualle-Brouri and P. Grangier Ann. Phys. Fr., 32 2-3 (2007) 163-165 Published online: 23 May 2008 DOI: 10.1051/anphys:2008033