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

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 w...

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Bibliographic Details
Published in:IEEE access 2021, Vol.9, p.94010-94016
Main Authors: Carine, Jaime, Gomez, Santiago A., Obregon, Giannini F., Gomez, Esteban S., Figueroa, Miguel, Lima, Gustavo, Xavier, Guilherme B.
Format: Article
Language:English
Subjects:
Bell's inequality
Circuits
Clocks
coincidence counting
Delays
Detectors
Field programmable gate arrays
Image edge detection
Logic gates
Photonics
Photons
quantum information
Quantum optics
Quantum phenomena
Visualization
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Summary: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.
ISSN:2169-3536
2169-3536
DOI:10.1109/ACCESS.2021.3093371