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Optics Letters

Optics Letters


  • Editor: Xi-Cheng Zhang
  • Vol. 39, Iss. 17 — Sep. 1, 2014
  • pp: 5078–5081

Quantum key distribution over a 72  dB channel loss using ultralow dark count superconducting single-photon detectors

Hiroyuki Shibata, Toshimori Honjo, and Kaoru Shimizu  »View Author Affiliations

Optics Letters, Vol. 39, Issue 17, pp. 5078-5081 (2014)

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We report the first quantum key distribution (QKD) experiment over a 72 dB channel loss using superconducting nanowire single-photon detectors (SSPD, SNSPD) with the dark count rate (DCR) of 0.01 cps. The DCR of the SSPD, which is dominated by the blackbody radiation at room temperature, is blocked by introducing cold optical bandpass filter. We employ the differential phase shift QKD (DPS-QKD) scheme with a 1 GHz system clock rate. The quantum bit error rate (QBER) below 3% is achieved when the length of the dispersion shifted fiber (DSF) is 336 km (72 dB loss), which is low enough to generate secure keys.

© 2014 Optical Society of America

OCIS Codes
(040.5570) Detectors : Quantum detectors
(270.5570) Quantum optics : Quantum detectors
(270.5568) Quantum optics : Quantum cryptography

ToC Category:
Quantum Optics

Original Manuscript: June 13, 2014
Revised Manuscript: July 25, 2014
Manuscript Accepted: July 25, 2014
Published: August 20, 2014

Virtual Issues
October 8, 2014 Spotlight on Optics

Hiroyuki Shibata, Toshimori Honjo, and Kaoru Shimizu, "Quantum key distribution over a 72  dB channel loss using ultralow dark count superconducting single-photon detectors," Opt. Lett. 39, 5078-5081 (2014)

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Fig. 1. Fig. 2. Fig. 3.

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