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Optics Express

Optics Express

  • Editor: Michael Duncan
  • Vol. 12, Iss. 9 — May. 3, 2004
  • pp: 2011–2016

Quantum key distribution with 1.25 Gbps clock synchronization

J. C. Bienfang, A. J. Gross, A. Mink, B. J. Hershman, A. Nakassis, X. Tang, R. Lu, D. H. Su, Charles W. Clark, Carl J. Williams, E. W. Hagley, and Jesse Wen  »View Author Affiliations

Optics Express, Vol. 12, Issue 9, pp. 2011-2016 (2004)

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We have demonstrated the exchange of sifted quantum cryptographic key over a 730 meter free-space link at rates of up to 1.0 Mbps, two orders of magnitude faster than previously reported results. A classical channel at 1550 nm operates in parallel with a quantum channel at 845 nm. Clock recovery techniques on the classical channel at 1.25 Gbps enable quantum transmission at up to the clock rate. System performance is currently limited by the timing resolution of our silicon avalanche photodiode detectors. With improved detector resolution, our technique will yield another order of magnitude increase in performance, with existing technology.

© 2004 Optical Society of America

OCIS Codes
(030.5260) Coherence and statistical optics : Photon counting
(060.4510) Fiber optics and optical communications : Optical communications
(200.2610) Optics in computing : Free-space digital optics
(270.5570) Quantum optics : Quantum detectors

ToC Category:
Research Papers

Original Manuscript: April 7, 2004
Revised Manuscript: April 26, 2004
Published: May 3, 2004

J. Bienfang, A. Gross, A. Mink, B. Hershman, A. Nakassis, X. Tang, R. Lu, D. Su, Charles Clark, Carl Williams, E. Hagley, and Jesse Wen, "Quantum key distribution with 1.25 Gbps clock synchronization," Opt. Express 12, 2011-2016 (2004)

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