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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 15, Iss. 23 — Nov. 12, 2007
  • pp: 15377–15386

A wavelength-tunable fiber-coupled source of narrowband entangled photons

Alessandro Fedrizzi, Thomas Herbst, Andreas Poppe, Thomas Jennewein, and Anton Zeilinger  »View Author Affiliations


Optics Express, Vol. 15, Issue 23, pp. 15377-15386 (2007)
http://dx.doi.org/10.1364/OE.15.015377


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Abstract

We demonstrate a wavelength-tunable, fiber-coupled source of polarization-entangled photons with extremely high spectral brightness and quality of entanglement. Using a 25 mm PPKTP crystal inside a polarization Sagnac interferometer we detect a spectral brightness of 273000 pairs (s mW nm)-1, a factor of 28 better than comparable previous sources while state tomography showed the two-photon state to have a tangle of T = 0.987. This improvement was achieved by use of a long crystal, careful selection of focusing parameters and single-mode fiber coupling. We demonstrate that, due to the particular geometry of the setup, the signal and idler wavelengths can be tuned over a wide range without loss of entanglement.

© 2007 Optical Society of America

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

ToC Category:
Quantum Optics

History
Original Manuscript: September 14, 2007
Revised Manuscript: October 25, 2007
Manuscript Accepted: October 26, 2007
Published: November 5, 2007

Citation
Alessandro Fedrizzi, Thomas Herbst, Andreas Poppe, Thomas Jennewein, and Anton Zeilinger, "A wavelength-tunable fiber-coupled source of narrowband entangled photons," Opt. Express 15, 15377-15386 (2007)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-15-23-15377


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