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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 15, Iss. 24 — Nov. 26, 2007
  • pp: 15920–15927

Field trial of differential-phase-shift quantum key distribution using polarization independent frequency up-conversion detectors

T. Honjo, S. Yamamoto, T. Yamamoto, H. Kamada, Y. Nishida, O. Tadanaga, M. Asobe, and K. Inoue  »View Author Affiliations

Optics Express, Vol. 15, Issue 24, pp. 15920-15927 (2007)

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We report a field trial of differential phase shift quantum key distribution (QKD) using polarization independent frequency up-conversion detectors. A frequency up-conversion detector is a promising device for achieving a high key generation rate when combined with a high clock rate QKD system. However, its polarization dependence prevents it from being applied to practical QKD systems. In this paper, we employ a modified polarization diversity configuration to eliminate the polarization dependence. Applying this method, we performed a long-term stability test using a 17.6-km installed fiber. We successfully demonstrated stable operation for 6 hours and achieved a sifted key generation rate of 120 kbps and an average quantum bit error rate of 3.14 %. The sifted key generation rate was not the estimated value but the effective value, which means that the sifted key was continuously generated at a rate of 120 kbps for 6 hours.

© 2007 Optical Society of America

OCIS Codes
(190.4370) Nonlinear optics : Nonlinear optics, fibers
(270.0270) Quantum optics : Quantum optics

ToC Category:
Nonlinear Optics

Original Manuscript: September 10, 2007
Revised Manuscript: November 9, 2007
Manuscript Accepted: November 14, 2007
Published: November 16, 2007

T. Honjo, S. Yamamoto, T. Yamamoto, H. Kamada, Y. Nishida, O. Tadanaga, M. Asobe, and K. Inoue, "Field trial of differential-phase-shift quantum key distribution using polarization independent frequency up-conversion detectors," Opt. Express 15, 15920-15927 (2007)

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