We report on an electronic coincidence detection circuit for quantum photonic applications implemented on a field-programmable gate array (FPGA), which records each the time separation between detection events coming from single-photon detectors.We achieve a coincidence window as narrow as 500 ps with a series Underwater of optimizations on a readily-available and affordable FPGA development board.Our implementation allows real-time visualization of coincidence measurements for multiple coincidence window widths simultaneously.To demonstrate the advantage of our high-resolution visualization, we certified the generation of polarized entangled photons by collecting data from multiple coincidence windows with minimal accidental counts, obtaining a violation of the Clauser-Horne-Shimony-Holt (CHSH) Bell inequality by more than 338 standard deviations.
Our results have shown the applicability of our electronic Front Loader Outer Tub Gasket design in the field of quantum information.