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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 16 — Aug. 2, 2010
  • pp: 16777–16787

Long-distance entanglement-based quantum key distribution experiment using practical detectors

Hiroki Takesue, Ken-ichi Harada, Kiyoshi Tamaki, Hiroshi Fukuda, Tai Tsuchizawa, Toshifumi Watanabe, Koji Yamada, and Sei-ichi Itabashi  »View Author Affiliations

Optics Express, Vol. 18, Issue 16, pp. 16777-16787 (2010)

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We report an entanglement-based quantum key distribution experiment that we performed over 100 km of optical fiber using a practical source and detectors. We used a silicon-based photon-pair source that generated high-purity time-bin entangled photons, and high-speed single photon detectors based on InGaAs/InP avalanche photodiodes with the sinusoidal gating technique. To calculate the secure key rate, we employed a security proof that validated the use of practical detectors. As a result, we confirmed the successful generation of sifted keys over 100 km of optical fiber with a key rate of 4.8 bit/s and an error rate of 9.1%, with which we can distill secure keys with a key rate of 0.15 bit/s.

© 2010 Optical Society of America

OCIS Codes
(190.4390) Nonlinear optics : Nonlinear optics, integrated optics
(270.5565) Quantum optics : Quantum communications

ToC Category:
Quantum Optics

Original Manuscript: June 7, 2010
Revised Manuscript: July 14, 2010
Manuscript Accepted: July 18, 2010
Published: July 23, 2010

Hiroki Takesue, Ken-ichi Harada, Kiyoshi Tamaki, Hiroshi Fukuda, Tai Tsuchizawa, Toshifumi Watanabe, Koji Yamada, and Sei-ichi Itabashi, "Long-distance entanglement-based quantum key distribution experiment using practical detectors," Opt. Express 18, 16777-16787 (2010)

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