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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 15, Iss. 12 — Jun. 11, 2007
  • pp: 7247–7260

1310-nm quantum key distribution system with up-conversion pump wavelength at 1550 nm

Hai Xu, Lijun Ma, Alan Mink, Barry Hershman, and Xiao Tang  »View Author Affiliations

Optics Express, Vol. 15, Issue 12, pp. 7247-7260 (2007)

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We show that the performance of a 1310-nm quantum key distribution (QKD) system with up-conversion detectors pumped at 1550 nm is comparable with or better than that of current 1550-nm QKD systems with a pump at shorter wavelength. The nonlinearly-induced dark counts are reduced when the wavelength of the pump light is longer than that of the quantum signal. We have developed a 1550-nm pump up-conversion detector for a 1310-nm QKD system, and we experimentally study the polarization sensitivity, pump-signal format, and various influences on the dark count rate. Using this detector in a proof-of-principle experiment, we have achieved a secure key rate of 500 kbit/s at 10 km and 9.1 kbit/s at 50 km in a 625-MHz, B92, polarization-coding QKD system, and we expect that the system performance could be improved further.

© 2007 Optical Society of America

OCIS Codes
(030.5260) Coherence and statistical optics : Photon counting
(060.2330) Fiber optics and optical communications : Fiber optics communications
(060.4510) Fiber optics and optical communications : Optical communications
(270.5570) Quantum optics : Quantum detectors

ToC Category:
Fiber Optics and Optical Communications

Original Manuscript: February 7, 2007
Revised Manuscript: May 16, 2007
Manuscript Accepted: May 20, 2007
Published: May 30, 2007

Hai Xu, Lijun Ma, Alan Mink, Barry Hershman, and Xiao Tang, "1310-nm quantum key distribution system with up-conversion pump wavelength at 1550 nm," Opt. Express 15, 7247-7260 (2007)

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