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Publication Citation: Practical long-distance quantum key distribution system using decoy levels

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Author(s): Danna Rosenberg; Charles G. Peterson; Jim A. Harrington; Patrick R. Rice; N. Dallman; K. T. Tyagi; K. P. McCabe; Sae Woo Nam; Burm Baek; Robert Hadfield; Richard J. Hughes; Jane E. Nordholt;
Title: Practical long-distance quantum key distribution system using decoy levels
Published: April 30, 2009
Abstract: Quantum key distribution (QKD) has the potential for widespread real-world applications, but 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 (BB84)protocol with low-noise superconducting nanowire single-photon detectors (SNSPDs) and decoy levels to produce a secret key with unconditional security over a record 140.6 km of optical fibre, an increase of more than a factor of five compared with the previous record for unconditionally secure key generation in a practical QKD system.
Citation: New Journal of Physics
Issue: 11
Pages: 10 pp.
Keywords: quantum key distribution;decoy states;BB84;superconducting detectors;sspd
Research Areas: Quantum Information and Measurements
PDF version: PDF Document Click here to retrieve PDF version of paper (632KB)