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Single-photon detectors are a pivotal component in photonic quantumtechnologies. A precise and comprehensive calibration of the intrinsicdetection efficiency is of utmost importance to ensure the proper evaluation ofthe performance in view of the specific technological application of interest,such as the protection against security breaches in quantum cryptographicsolutions. Here we report on a systematic study on and comprehensive analysisof the estimation of the intrinsic detection efficiency of two commercialsingle-photon detectors based on single-photon avalanche diodes (SPADs) forvarious mean photon numbers and at high laser pulse repetition rates usingdifferent techniques. We observed an unexpected and signifucant drop inintrinsic detection efficiency at detection rates of 10 % and higher relativeto the maximum detection rate. It is demonstrated that for data analysis astatistical model for the detection rate conveniently can be used if notimestamped data are available. We conclude that the full characterization ofsingle-photon detectors used in critical applications should include thesensitivity of their intrinsic detection efficiency to high event rates.

Unexpected detection rate dependence of the intrinsic detection efficiency in single-photon detectors based on avalanche diodes