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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 16, Iss. 22 — Oct. 27, 2008
  • pp: 18145–18151

Bright filter-free source of indistinguishable photon pairs

F. Wolfgramm, X. Xing, A. Cerè, A. Predojević, A. M. Steinberg, and M. W. Mitchell  »View Author Affiliations


Optics Express, Vol. 16, Issue 22, pp. 18145-18151 (2008)
http://dx.doi.org/10.1364/OE.16.018145


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Abstract

We demonstrate a high-brightness source of pairs of indistinguishable photons based on a type-II phase-matched doubly-resonant optical parametric oscillator operated far below threshold. The cavity-enhanced down-conversion output of a PPKTP crystal is coupled into two single-mode fibers with a mode coupling efficiency of 58%. The high degree of indistinguishability between the photons of a pair is demonstrated by a Hong-Ou-Mandel interference visibility of higher than 90% without any filtering at an instantaneous coincidence rate of 450 000 pairs/s per mW of pump power per nm of down-conversion bandwidth. For the degenerate spectral mode with a linewidth of 7 MHz at 795 nm a rate of 70 pairs/(s mW MHz) is estimated, increasing the spectral brightness for indistinguishable photons by two orders of magnitude compared to similar previous sources.

© 2008 Optical Society of America

OCIS Codes
(190.4410) Nonlinear optics : Nonlinear optics, parametric processes
(230.6080) Optical devices : Sources
(270.0270) Quantum optics : Quantum optics

ToC Category:
Quantum Optics

History
Original Manuscript: July 29, 2008
Revised Manuscript: October 2, 2008
Manuscript Accepted: October 17, 2008
Published: October 22, 2008

Citation
F. Wolfgramm, X. Xing, A. Cerè, A. Predojević, A. M. Steinberg, and M. W. Mitchell, "Bright filter-free source of indistinguishable photon pairs," Opt. Express 16, 18145-18151 (2008)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-16-22-18145


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