The generation of polarization-entangled photon pairs using periodically poled lithium niobate waveguides in a fibre loop

This is the authors' abstract. We don't add key points for this paper.

We report the generation of polarization-entangled photon pairs at a telecom band using two cascade periodically poled lithium niobate waveguides in a fibre loop. The phase of an entangled photon state was stabilized automatically in our setup. The average visibility was about 93.5 ± 2.6% for the entangled photon pairs after subtracting accidental coincidences in our measurement.