Generation of time-bin entangled photon pairs using cascaded second order nonlinearity in single periodically-poled lithium niobate waveguide

摘要

We report a simple scheme to generate time-bin entangled photon pairs based on cascaded second-order nonlinear processes in a single periodically-poled lithium niobate waveguide. We successfully observed two-photon interference fringes up to 97% visibilities.