@Article{Murphy_etal2015,
author="Murphy, A.
and Semenov, A.
and Korneev, A.
and Korneeva, Y.
and Gol{\textquoteright}tsman, G.
and Bezryadin, A.",
title="Three temperature regimes in superconducting photon detectors: quantum, thermal and multiple phase-slips as generators of dark counts",
journal="Sci. Rep.",
year="2015",
volume="5",
pages="10174 (1 to 10)",
optkeywords="SPD; SSPD; SNSPD",
abstract="We perform measurements of the switching current distributions of three w approximately 120 nm wide, 4 nm thick NbN superconducting strips which are used for single-photon detectors. These strips are much wider than the diameter of the vortex cores, so they are classified as quasi-two-dimensional (quasi-2D). We discover evidence of macroscopic quantum tunneling by observing the saturation of the standard deviation of the switching distributions at temperatures around 2 K. We analyze our results using the Kurkijarvi-Garg model and find that the escape temperature also saturates at low temperatures, confirming that at sufficiently low temperatures, macroscopic quantum tunneling is possible in quasi-2D strips and can contribute to dark counts observed in single photon detectors. At the highest temperatures the system enters a multiple phase-slip regime. In this range single phase-slips are unable to produce dark counts and the fluctuations in the switching current are reduced.",
optnote="PMID:25988591; PMCID:PMC4437302",
optnote="exported from refbase (https://db.rplab.ru/refbase/show.php?record=1344), last updated on Wed, 12 May 2021 14:15:23 -0500",
issn="2045-2322",
doi="10.1038/srep10174",
opturl="http://www.ncbi.nlm.nih.gov/pubmed/25988591",
opturl="https://doi.org/10.1038/srep10174"
}