Long-distance quantum key distribution in optical fiber

Use of low-noise detectors can both increase the secret bit rate of long-distance quantum key distribution (QKD) and dramatically extend the length of a fibre optic link over which secure key can be distributed. Previous work has demonstrated use of ultra-low-noise transition-edge sensors (TESs) in...

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Bibliographic Details
Published in:arXiv.org 2006-07
Main Authors: Hiskett, P A, Rosenberg, D, Peterson, C G, Hughes, R J, Nam, S, Lita, A E, Miller, A J, Nordholt, J E
Format: Article
Language:English
Subjects:
Error correction
Optical fibers
Quantum cryptography
Online Access:Get full text
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Summary:Use of low-noise detectors can both increase the secret bit rate of long-distance quantum key distribution (QKD) and dramatically extend the length of a fibre optic link over which secure key can be distributed. Previous work has demonstrated use of ultra-low-noise transition-edge sensors (TESs) in a QKD system with transmission over 50 km. In this work, we demonstrate the potential of the TESs by successfully generating error-corrected, privacy-amplified key over 148.7 km of dark optical fibre at a mean photon number mu = 0.1, or 184.6 km of dark optical fibre at a mean photon number of 0.5. We have also exchanged secret key over 67.5 km that is secure against powerful photon-number-splitting attacks.
ISSN:2331-8422
DOI:10.48550/arxiv.0607177