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

Abstract

We demonstrate pulsed polarization-entangled photons generated from a periodically poled $\mathrm{KTiOP}{\mathrm{O}}_4$ (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 $\pm$ 0.0002 for $|{\psi }^{-}⟩$ and 0.980 $\pm$ 0.001 for $|{\psi }^{+}⟩$ respectively. This GVM-PPKTP-Sagnac scheme is directly applicable to quantum communication experiments at telecom wavelength, especially in free space.

5 pages, 5 figures http://dx.doi.org/10.1364/OE.22.011498

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