P A Hiskett et al 2006 New J. Phys. 8 193 doi:10.1088/1367-2630/8/9/193
Long-distance quantum key distribution in optical fibre
P A Hiskett1, D Rosenberg1,4, C G Peterson1, R J Hughes1, S Nam2, A E Lita2, A J Miller3 and J E Nordholt1
Show affiliationsUse 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 keys can be distributed. Previous work has demonstrated the use of ultra-low-noise transition-edge sensors (TESs) in a QKD system with transmission over 50 km. In this study, we demonstrate the potential of the TESs by successfully generating an error-corrected, privacy-amplified key over 148.7 km of dark optical fibre at a mean photon number μ = 0.1, or 184.6 km of dark optical fibre at a mean photon number of 0.5. We have also exchanged secret keys over 67.5 km that is secure against powerful photon-number-splitting (PNS) attacks.
- PACS
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42.79.Sz Optical communication systems, multiplexers, and demultiplexers
- Subjects
- Dates
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Issue 9 (September 2006)
Received 23 June 2006
Published 14 September 2006
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Long-distance quantum key distribution in optical fibre
P A Hiskett et al 2006 New J. Phys. 8 193
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