Origin of intrinsic dark count in superconducting nanowire single-photon detectors

Details Origin of intrinsic dark count in superconducting nanowire single-photon detectors Origin of intrinsic dark count in superconducting nanowire single-photon detectors

2011-03-15

arxiv.org/abs/1103.2844v2

Applied Physics Letters 99, 161105 (2011)

Physics

Condensed Matter

Superconductivity

10 pages, 2 figures

Scientific paper

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 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.

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