Journal
APPLIED PHYSICS LETTERS
Volume 99, Issue 16, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3652908
Keywords
fluctuations in superconductors; mixed state; nanowires; superconducting photodetectors
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Funding
- Grants-in-Aid for Scientific Research [23560431] Funding Source: KAKEN
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The origin of the decoherence in superconducting nanowire single-photon detectors, the so-called dark count, was investigated. We measured the direct-current characteristics and bias-current dependencies of the dark count rate in a wide range of temperatures from 0.5 K to 4.0 K, and analyzed the results by theoretical models of thermal fluctuations of vortices. Our results indicate that the current-assisted unbinding of vortex-antivortex pairs is the dominant origin of the dark count. (C) 2011 American Institute of Physics. [doi: 10.1063/1.3652908]
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