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Investigation of the dependence of noise characteristics of SPAD on the gate parameters in sine-wave gated single-photon detectors
A. V. Losev, V. V. Zavodilenko, A. A. Koziy, Y. V. Kurochkin, A. A. Gorbatsevich
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In this paper, we have investigated a self-developed sine wave gated (SWG) single-photon detector (SPD) for 1550 nm wavelength primary for quantum key distribution (QKD) usage. We have investigated different gate parameters` influence on the SPD`s noise characteristics. We have admitted that with an increase of gating voltage and constant value of quantum efficiency (QE), the dark count rate (DCR) decreases. There have been made some recommendations to improve SPD`s and whole QKD device's characteristics based on these observations. There have been discovered the quick rise of the DCR value with the increase of gating voltage above some certain value and this value was different for different detectors. It has been shown that universal empirical dependence compilation to connect control and operational parameters of SPD is a non-trivial task.
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