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Regular version of the site

Article

Single photon detection system for visible and infrared spectrum range

Optics Letters. 2018. Vol. 43. No. 24. P. 6085-6088.
Золотов Ф. И., Smirnov K., Divochiy A., Misiaszek M., Vakhtomin Y., Morozov P., Kolenderski P.

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 4×1044×104 in our detection setting. A photon detection efficiency as high as 64% at 1550 nm and 15% at 2300 nm was observed.