Characteristics of superconducting single photon detector in DPS-QKD system under bright illumination blinding attack
Mikio Fujiwara, Toshimori Honjo, Kaoru Shimizu, Kiyoshi Tamaki, and, Masahide Sasaki
TL;DR
This paper models the time-dependent detection probability of superconducting single photon detectors (SSPDs) under bright illumination attacks in QKD systems, aiding in security assessment.
Contribution
It introduces a novel time-dependent probability equation for SSPDs and validates it experimentally under blinding attack conditions.
Findings
Good agreement between theoretical and experimental detection probabilities
Enhanced understanding of SSPD response to bright pulses
Implications for security analysis in QKD systems
Abstract
We derive the time-dependent photo-detection probability equation of a superconducting single photon detector (SSPD) to study the responsive property for a pulse train at high repetition rate. Using this equation, we analyze the characteristics of SSPDs when illuminated by bright pulses in blinding attack on a quantum key distribution (QKD). We obtain good agreement between expected values based on our equation and actual experimental values. Such a time-dependent probability analysis contributes to security analysis.
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