Post-Measurement Adjustment of the Coincidence Window in Quantum Optics Experiments

Post-Measurement Adjustment of the Coincidence Window in Quantum Optics Experiments

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We report on an electronic coincidence detection circuit for quantum photonic applications implemented standoff kingsville ontario 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 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 2000 dodge durango catalytic converter 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 design in the field of quantum information.