Rosenberg, D.
, Peterson, C.
, Harrington, J.
, Rice, P.
, Dallman, N.
, Tyagi, K.
, McCabe, K.
, Nam, S.
, Baek, B.
, Hadfield, R.
, Hughes, R.
and Nordholt, J.
(2009),
Practical long-distance quantum key distribution system using decoy levels, New Journal of Physics, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=33013
(Accessed October 13, 2025)
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Practical long-distance quantum key distribution system using decoy levels
Published
Author(s)
Danna Rosenberg, Charles G. Peterson, Jim A. Harrington, Patrick R. Rice, N. Dallman, K. T. Tyagi, K. P. McCabe, , , Robert Hadfield, Richard J. Hughes, Jane E. Nordholt
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
Pub Type
Journals
Download Paper
Keywords
quantum key distribution, decoy states, BB84, superconducting detectors, sspd
Citation
Issues
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Created April 29, 2009, Updated October 12, 2021