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Optics Express

Optics Express

  • Editor: Michael Duncan
  • Vol. 14, Iss. 10 — May. 15, 2006
  • pp: 4264–4269

Polarization insensitive phase modulator for quantum cryptosystems

Bing Qi, Lei-Lei Huang, Hoi-Kwong Lo, and Li Qian  »View Author Affiliations

Optics Express, Vol. 14, Issue 10, pp. 4264-4269 (2006)

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In this paper, we propose a polarization-insensitive phase modulation scheme based on frequency modulation of light waves using either one or a pair of acousto-optic modulators. A stable Sagnac quantum key distribution (QKD) system employing this technique is also proposed. The interference visibility for a 40km and a 10km fiber loop is 96% and 99% respectively, at single-photon level. We ran standard BB84 QKD protocol in a simplified Sagnac setup (40km fiber loop) continuously for one hour and the measured quantum bit error rate stayed within 2%–5% range.

© 2006 Optical Society of America

OCIS Codes
(060.2330) Fiber optics and optical communications : Fiber optics communications
(060.5060) Fiber optics and optical communications : Phase modulation
(270.0270) Quantum optics : Quantum optics

ToC Category:
Fiber Optics and Optical Communications

Original Manuscript: March 22, 2006
Manuscript Accepted: April 25, 2006
Published: May 15, 2006

Bing Qi, Lei-Lei Huang, Hoi-Kwong Lo, and Li Qian, "Polarization insensitive phase modulator for quantum cryptosystems," Opt. Express 14, 4264-4269 (2006)

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