“…5) Compared with avalanche photodiodes (APDs) and photomultiplier tubes (PMTs), SNSPD has many merits in near-infrared wavelength such as a negligible dark count rate (<10 Hz), a small timing jitter (~50 ps), a high counting rate (>1 GHz), and a high quantum efficiency (>25%). 6,7) For practical application of SNSPD, there are a few issues that need to be solved or further studied, for example, the photon number resolution ability, the kinetic inductance, the timing jitter, and the latching behavior.…”