Fully fibered polarization entangled photon pair source at a telecom wavelength for long distance Q-networking
Résumé
In this paper we present the experimental results obtained on a new fully fibred polarization entangled photon- pair source at a telecom wavelength (1560 nm). Photon pairs are created using a type-0 interaction in a periodically poled lithium niobate waveguide, which has been shown to be the most efficient for non linear crystals. Polarization entanglement is then generated using a polarization dependent fibre delay line. Compared to a similar configuration reported previously, we obtain much higher visibilities on the violation of the Bell inequalities (≥ 97%), due to active delay line stabilization. In addition we remove the stringent constraint on the exact delay line length.