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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 41, Iss. 9 — Mar. 20, 2002
  • pp: 1640–1648

Enhanced autocompensating quantum cryptography system

Donald S. Bethune, Martha Navarro, and William P. Risk  »View Author Affiliations


Applied Optics, Vol. 41, Issue 9, pp. 1640-1648 (2002)
http://dx.doi.org/10.1364/AO.41.001640


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Abstract

We have improved the hardware and software of our autocompensating system for quantum key distribution by replacing bulk optical components at the end stations with fiber-optic equivalents and implementing software that synchronizes end-station activities, communicates basis choices, corrects errors, and performs privacy amplification over a local area network. The all-fiber-optic arrangement provides stable, efficient, and high-contrast routing of the photons. The low-bit error rate leads to high error-correction efficiency and minimizes data sacrifice during privacy amplification. Characterization measurements made on a number of commercial avalanche photodiodes are presented that highlight the need for improved devices tailored specifically for quantum information applications. A scheme for frequency shifting the photons returning from Alice’s station to allow them to be distinguished from backscattered noise photons is also described.

© 2002 Optical Society of America

OCIS Codes
(030.5260) Coherence and statistical optics : Photon counting
(060.0060) Fiber optics and optical communications : Fiber optics and optical communications
(060.2360) Fiber optics and optical communications : Fiber optics links and subsystems
(230.2240) Optical devices : Faraday effect
(270.5570) Quantum optics : Quantum detectors

History
Original Manuscript: March 22, 2001
Revised Manuscript: October 30, 2001
Published: March 20, 2002

Citation
Donald S. Bethune, Martha Navarro, and William P. Risk, "Enhanced autocompensating quantum cryptography system," Appl. Opt. 41, 1640-1648 (2002)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-41-9-1640


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