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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 22, Iss. 10 — May. 19, 2014
  • pp: 11498–11507

Pulsed Sagnac polarization-entangled photon source with a PPKTP crystal at telecom wavelength

Rui-Bo Jin, Ryosuke Shimizu, Kentaro Wakui, Mikio Fujiwara, Taro Yamashita, Shigehito Miki, Hirotaka Terai, Zhen Wang, and Masahide Sasaki  »View Author Affiliations


Optics Express, Vol. 22, Issue 10, pp. 11498-11507 (2014)
http://dx.doi.org/10.1364/OE.22.011498


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Abstract

We demonstrate pulsed polarization-entangled photons generated from a periodically poled KTiOPO4 (PPKTP) crystal in a Sagnac interferometer configuration at telecom wavelength. Since the group-velocity-matching (GVM) condition is satisfied, the intrinsic spectral purity of the photons is much higher than in the previous scheme at around 800 nm wavelength. The combination of a Sagnac interferometer and the GVM-PPKTP crystal makes our entangled source compact, stable, highly entangled, spectrally pure and ultra-bright. The photons were detected by two superconducting nanowire single photon detectors (SNSPDs) with detection efficiencies of 70% and 68% at dark counts of less than 1 kcps. We achieved fidelities of 0.981 ± 0.0002 for |ψ〉 and 0.980 ± 0.001 for |ψ+〉 respectively. This GVM-PPKTP-Sagnac scheme is directly applicable to quantum communication experiments at telecom wavelength, especially in free space.

© 2014 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: March 13, 2014
Revised Manuscript: April 18, 2014
Manuscript Accepted: April 18, 2014
Published: May 5, 2014

Citation
Rui-Bo Jin, Ryosuke Shimizu, Kentaro Wakui, Mikio Fujiwara, Taro Yamashita, Shigehito Miki, Hirotaka Terai, Zhen Wang, and Masahide Sasaki, "Pulsed Sagnac polarization-entangled photon source with a PPKTP crystal at telecom wavelength," Opt. Express 22, 11498-11507 (2014)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-22-10-11498


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