Single photon detection system for visible and infrared spectrum range.

@article{Divochiy2018SinglePD,
  title={Single photon detection system for visible and infrared spectrum range.},
  author={Alexander Divochiy and Marta Misiaszek and Yury B. Vakhtomin and Pavel Morozov and Konstantin Smirnov and Philipp I. Zolotov and Piotr Kolenderski},
  journal={Optics letters},
  year={2018},
  volume={43 24},
  pages={
          6085-6088
        }
}
We demonstrate niobium nitride based superconducting single-photon detectors sensitive in the spectral range 452-2300 nm. The system performance was tested in a real-life experiment with correlated photons generated by means of spontaneous parametric downconversion, where one photon was in the visible range and the other was in the infrared range. We measured a signal to noise ratio as high as 4×104 in our detection setting. A photon detection efficiency as high as 64% at 1550 nm and 15% at… 

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