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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 17, Iss. 21 — Oct. 12, 2009
  • pp: 18920–18933

Optimizing type-I polarization-entangled photons

Radhika Rangarajan, Michael Goggin, and Paul Kwiat  »View Author Affiliations

Optics Express, Vol. 17, Issue 21, pp. 18920-18933 (2009)

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Optical quantum information processing needs ultra-bright sources of entangled photons, especially from synchronizable femtosecond lasers and low-cost cw-diode lasers. Decoherence due to timing information and spatial mode-dependent phase has traditionally limited the brightness of such sources. We report on a variety of methods to optimize type-I polarization-entangled sources — the combined use of different compensation techniques to engineer high-fidelity pulsed and cw-diode laser-pumped sources, as well as the first production of polarization-entanglement directly from the highly nonlinear biaxial crystal BiB3O6 (BiBO). Using spatial compensation, we show more than a 400-fold improvement in the phase flatness, which otherwise limits efficient collection of entangled photons from BiBO, and report the highest fidelity to date (99%) of any ultrafast polarization-entanglement source. Our numerical code, available on our website, can design optimal compensation crystals and simulate entanglement from a variety of type-I phasematched nonlinear crystals.

© 2009 OSA

OCIS Codes
(190.4410) Nonlinear optics : Nonlinear optics, parametric processes
(270.0270) Quantum optics : Quantum optics
(320.0320) Ultrafast optics : Ultrafast optics

ToC Category:
Quantum Optics

Original Manuscript: September 1, 2009
Revised Manuscript: September 27, 2009
Manuscript Accepted: September 30, 2009
Published: September 6, 2009

Radhika Rangarajan, Michael Goggin, and Paul Kwiat, "Optimizing type-I polarization-entangled photons," Opt. Express 17, 18920-18933 (2009)

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