Publication:
Post-Measurement adjustment of the coincidence window in quantum optics experiments

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Date
2021
Authors
Dr. Cariñe-Catrileo, Jaime
Gomez, Santiago A.
Obregon, Giannini F.
Gomez, Esteban S.
Figueroa, Miguel
Lima, Gustavo
Xavier, Guilherme
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Publisher
IEEE Access
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Abstract
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 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 design in the field of quantum information.
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Keywords
Field-programmable gate arrays, Quantum information, Coincidence counting
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