Physics – Quantum Physics
Scientific paper
2008-12-17
New J. Phys. 11, 045023 (2009)
Physics
Quantum Physics
15 pages, 6 figures, submitted to New Journal of Physics (Special issue on Quantum Cryptography)
Scientific paper
10.1088/1367-2630/11/4/045023
We have designed and realized a prototype that implements a continuous-variable quantum key distribution protocol based on coherent states and reverse reconciliation. The system uses time and polarization multiplexing for optimal transmission and detection of the signal and phase reference, and employs sophisticated error-correction codes for reconciliation. The security of the system is guaranteed against general coherent eavesdropping attacks. The performance of the prototype was tested over preinstalled optical fibres as part of a quantum cryptography network combining different quantum key distribution technologies. The stable and automatic operation of the prototype over 57 hours yielded an average secret key distribution rate of 8 kbit/s over a 3 dB loss optical fibre, including the key extraction process and all quantum and classical communication. This system is therefore ideal for securing communications in metropolitan size networks with high speed requirements.
Debuisschert Thierry
Diamanti Eleni
Fossier Simon
Grangier Philippe
Tualle-Brouri Rosa
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