Experimental observation of anomalous supralinear response of single-photon detectors
arXiv:2109.08347 · doi:10.1063/5.0106987
Abstract
We demonstrate a direct single-source measurement of absolute nonlinearity of single-photon detectors with unprecedented accuracy. We discover a surprising supralinear behavior of single-photon avalanche diodes and show that it cannot be explained using known theoretical models. We also fully characterize sub- and supra-linear operation regimes of superconducting nanowire single-photon detectors and uncover the supralinearity under faint continuous illumination. The results identify new detector anomalies that supersede existing knowledge of nonlinear effects at the single-photon level.
arXiv comment19 pages, 16 figures, 4 tables
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