Optimal spatial filtering for a bright entangled photon source
Alexander Lohrmann, Aitor Villar, Arian Stolk, Alexander Ling · arXiv (Cornell University) · 2018
We present an experimental demonstration of a bright and high fidelity entangled photon source. The source is constructed using two critically phase matched $\beta$-Barium Borate crystals with parallel optical axes and photon pairs are collected after filtering with a circular field-stop. Near unity fidelities are obtained with detected pair rates exceeding 100000 pairs/s/mW. Calculations of the angle dependent phase difference support the experimental data, and suggest strategies for further improvement. The source design is a promising candidate for emerging quantum applications outside of laboratory environments.