Practical long-distance quantum key distribution system using decoy levels

Details Practical long-distance quantum key distribution system using decoy levels Practical long-distance quantum key distribution system using decoy levels

2008-06-18

arxiv.org/abs/0806.3085v1

New J. Phys. 11, 045009 (2009)

Physics

Quantum Physics

9 pages

Scientific paper

10.1088/1367-2630/11/4/045009

Quantum key distribution (QKD) has the potential for widespread real-world applications. To date no secure long-distance experiment has demonstrated the truly practical operation needed to move QKD from the laboratory to the real world due largely to limitations in synchronization and poor detector performance. Here we report results obtained using a fully automated, robust QKD system based on the Bennett Brassard 1984 protocol (BB84) with low-noise superconducting nanowire single-photon detectors (SNSPDs) and decoy levels. Secret key is produced with unconditional security over a record 144.3 km of optical fibre, an increase of more than a factor of five compared to the previous record for unconditionally secure key generation in a practical QKD system.

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