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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Editor: Grover Swartzlander
  • Vol. 31, Iss. 9 — Sep. 1, 2014
  • pp: 2068–2076

Efficient heralding of polarization-entangled photons from type-0 and type-II spontaneous parametric downconversion in periodically poled KTiOPO4

Fabian Steinlechner, Marta Gilaberte, Marc Jofre, Thomas Scheidl, Juan P. Torres, Valerio Pruneri, and Rupert Ursin  »View Author Affiliations


JOSA B, Vol. 31, Issue 9, pp. 2068-2076 (2014)
http://dx.doi.org/10.1364/JOSAB.31.002068


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Abstract

Ultrabright sources of entangled photon pairs with high heralding efficiency are an important step in the pursuit of high-bit-rate entanglement-base quantum key distribution, as well as an enabling tool for loss-sensitive quantum optics experiments. Here, we present a robust single-mode fiber-coupled source of polarization-entangled photons around 810 nm with both high brightness and heralding efficiency. Our approach is based on quasi-phase-matched spontaneous parametric downconversion (SPDC) from periodically poled KTiOPO4 in a Sagnac loop configuration. We demonstrate a high degree of two-photon polarization entanglement for single-frequency-pumped type-0 and type-II SPDC, and conduct a conclusive comparison in terms of efficiency and spectral characteristics. In light of applications outside a laboratory environment, we evaluate the feasibility of pumping nonlinear crystals with free-running laser diodes.

© 2014 Optical Society of America

OCIS Codes
(270.0270) Quantum optics : Quantum optics
(190.4975) Nonlinear optics : Parametric processes
(270.5565) Quantum optics : Quantum communications

ToC Category:
Quantum Optics

History
Original Manuscript: May 8, 2014
Revised Manuscript: July 2, 2014
Manuscript Accepted: July 11, 2014
Published: August 7, 2014

Citation
Fabian Steinlechner, Marta Gilaberte, Marc Jofre, Thomas Scheidl, Juan P. Torres, Valerio Pruneri, and Rupert Ursin, "Efficient heralding of polarization-entangled photons from type-0 and type-II spontaneous parametric downconversion in periodically poled KTiOPO4," J. Opt. Soc. Am. B 31, 2068-2076 (2014)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-31-9-2068


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