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Author |
Murphy, A.; Semenov, A.; Korneev, A.; Korneeva, Y.; Gol'tsman, G.; Bezryadin, A. |
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Title |
Three temperature regimes in superconducting photon detectors: quantum, thermal and multiple phase-slips as generators of dark counts |
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Journal Article |
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Year |
2015 |
Publication |
Sci. Rep. |
Abbreviated Journal |
Sci. Rep. |
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Volume |
5 |
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Pages |
10174 (1 to 10) |
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Keywords |
SPD, SSPD, SNSPD |
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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. |
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Address |
Department of Physics, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA |
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ISSN |
2045-2322 |
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Notes |
PMID:25988591; PMCID:PMC4437302 |
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1344 |
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