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; P. Grangier

doi:10.1051/anphys:2008033

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Volume 32 / No 2-3 (2007)

Ann. Phys. Fr., 32 2-3 (2007) 163-165

Abstract

Issue		Ann. Phys. Fr. Volume 32, Number 2-3, 2007 COLOQ'1010th conference on lasers and quantum optics


Page(s)		163 - 165
Section		Short contributions
DOI		https://doi.org/10.1051/anphys:2008033
Published online		23 May 2008

Ann. Phys. Fr., Vol. 32, N°2-3 2007, pp. 163-165

Quantum key distribution over 25 km using a fibre set-up based on continuous variables

J. Lodewyck¹^,2, M. Bloch³, S. Fossier², E. Diamanti¹, T. Debuisschert², R. Tualle-Brouri¹ and P. Grangier¹

¹ Laboratoire Charles Fabry de l'Institut d'Optique, Campus Polytechnique, RD 128, 91127 Palaiseau Cedex, France
² Thales Research and Technology-France, RD 128, 91767 Palaiseau Cedex, France
³ Georgia-Tech Lorraine-CNRS Telecom, 2-3 rue Marconi, 57070 Metz, France

Corresponding author: thierry.debuisschert@thalesgroup.com

Abstract

We describe a continuous variable quantum key distribution set-up allowing for secret key rates over 2 kbits/s on a 25 km fibre link. The signal and the phase reference are time-multiplexed in the same fibre. The system is designed to be operated on an installed fibre link. The reconciliation step is performed using fast and efficient LDPC error correcting codes.