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We investigated the timing jitter of superconducting nanowire avalanchephotodetectors (SNAPs, also referred to as cascade switching superconductingsingle photon detectors) based on 30-nm-wide nanowires. At bias currents (IB)near the switching current, SNAPs showed sub 35 ps FWHM Gaussian jitter similarto standard 100 nm wide superconducting nanowire single-photon detectors. Atlower values of IB, the instrument response function (IRF) of the detectorsbecame wider, more asymmetric, and shifted to longer time delays. We couldreproduce the experimentally observed IRF time-shift in simulations based on anelectrothermal model, and explain the effect with a simple physical picture.

Timing performance of 30-nm-wide superconducting nanowire avalanche photodetectors