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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 17, Iss. 25 — Dec. 7, 2009
  • pp: 23153–23159

Three-color Sagnac source of polarization-entangled photon pairs

Michael Hentschel, Hannes Hübel, Andreas Poppe, and Anton Zeilinger  »View Author Affiliations

Optics Express, Vol. 17, Issue 25, pp. 23153-23159 (2009)

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We demonstrate a compact and stable source of polarization-entangled pairs of photons, one at 810 nm wavelength for high detection efficiency and the other at 1550 nm for long-distance fiber communication networks. Due to a novel Sagnac-based design of the interferometer no active stabilization is needed. Using only one 30 mm ppKTP bulk crystal the source produces photons with a spectral brightness of 1.13 × 106 pairs/s/mW/THz with an entanglement fidelity of 98.2%. Both photons are single-mode fiber coupled and ready to be used in quantum key distribution (QKD) or transmission of photonic quantum states over large distances.

© 2009 OSA

OCIS Codes
(270.0270) Quantum optics : Quantum optics
(270.5565) Quantum optics : Quantum communications
(270.5568) Quantum optics : Quantum cryptography

ToC Category:
Quantum Optics

Original Manuscript: October 30, 2009
Revised Manuscript: November 25, 2009
Manuscript Accepted: November 27, 2009
Published: December 2, 2009

Michael Hentschel, Hannes Hübel, Andreas Poppe, and Anton Zeilinger, "Three-color Sagnac source of polarization-entangled photon pairs," Opt. Express 17, 23153-23159 (2009)

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