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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 15, Iss. 3 — Feb. 5, 2007
  • pp: 1322–1327

Characterization of fiber-generated entangled photon pairs with superconducting single-photon detectors

Chuang Liang, Kim Fook Lee, Milja Medic, Prem Kumar, Robert H. Hadfield, and Sae Woo Nam  »View Author Affiliations

Optics Express, Vol. 15, Issue 3, pp. 1322-1327 (2007)

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We demonstrate the suitability of fiber-generated entangled photon pairs for practical quantum communications in the telecom band by measuring their properties with superconducting single-photon detectors that produce negligible dark counts. The photon pairs are created in approximately 5-ps duration windows at 50 MHz rate while the detectors are operated in ungated free running mode. We obtain a coincidence to accidental-coincidence ratio >80 with raw photon-counting data, i.e., without making any post-measurement corrections. Using a previously demonstrated counter-propagating scheme we also produce polarizationentangled photon pairs at 50-MHz rate, which in coincidence detection directly yield two-photon interference with a fringe visibility >98%.

© 2007 Optical Society of America

OCIS Codes
(040.5570) Detectors : Quantum detectors
(060.0060) Fiber optics and optical communications : Fiber optics and optical communications
(190.4370) Nonlinear optics : Nonlinear optics, fibers
(270.0270) Quantum optics : Quantum optics

ToC Category:
Quantum Optics

Original Manuscript: November 21, 2006
Revised Manuscript: January 15, 2007
Manuscript Accepted: January 18, 2007
Published: February 5, 2007

Chuang Liang, Kim F. Lee, Milja Medic, Prem Kumar, Robert H. Hadfield, and Sae W. Nam, "Characterization of fiber-generated entangled photon pairs with superconducting single-photon detectors," Opt. Express 15, 1322-1327 (2007)

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  1. M. Fiorentino, P. L. Voss, J. E. Sharping, and P. Kumar, "All-fiber photon-pair source for quantum communication," Photon. Technol. Lett. 14, 983-985 (2002). [CrossRef]
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