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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 15, Iss. 26 — Dec. 24, 2007
  • pp: 18339–18344

Quantum state tomography of a fiber-based source of polarization-entangled photon pairs

J. Fan, M. D Eisaman, and A. Migdall  »View Author Affiliations

Optics Express, Vol. 15, Issue 26, pp. 18339-18344 (2007)

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We report an experimental demonstration of a bright highfidelity single-mode-optical-fiber source of polarization-entangled photon pairs. The source takes advantage of single-mode fiber optics, highly nonlinear microstructure fiber, judicious phase-matching, and the inherent stability provided by a Sagnac interferometer. With a modest average pump power (300 µW), we create all four Bell states with a detected two-photon coincidence rate of 7 kHz per bandwidth of 0.9 nm, in a spectral range of more than 20 nm. To characterize the purity of the states produced by this source, we use quantum-state tomography to reconstruct the corresponding density matrices, with fidelities of 95 % or more for each Bell state.

© 2007 Optical Society of America

OCIS Codes
(060.4370) Fiber optics and optical communications : Nonlinear optics, fibers
(190.4380) Nonlinear optics : Nonlinear optics, four-wave mixing
(190.5650) Nonlinear optics : Raman effect

ToC Category:
Fiber Optics and Optical Communications

Original Manuscript: November 2, 2007
Revised Manuscript: December 14, 2007
Manuscript Accepted: December 17, 2007
Published: December 20, 2007

J. Fan, M. D. Eisaman, and A. Migdall, "Quantum state tomography of a fiber-based source of polarization-entangled photon pairs," Opt. Express 15, 18339-18344 (2007)

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