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Sensitivity and gigahertz counting performance of superconducting single-photon detectors
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View: Figures


Image of FIG. 1.
FIG. 1.

Experimental and dark counts as a function of the normalized current bias. The tests were performed on the same area, -thick detector for several radiation wavelengths. Closed (open) symbols correspond to measurements performed at , respectively. The solid lines represent the exponential fit to the data.

Image of FIG. 2.
FIG. 2.

of the from Fig. 1, calculated for several radiation wavelengths and presented as a function of the normalized bias current.

Image of FIG. 3.
FIG. 3.

Spectral dependence of , collected for two -thick (open and closed symbols), using laser diodes (circles) and a blackbody radiation (squares) as photon sources. The inset presents the hotspot area and diameter dependence on the incident photon energy (wavelength). The open and closed symbols correspond to the two devices presented in the main panel. The dashed line is a guide for the eyes.

Image of FIG. 4.
FIG. 4.

The photoresponse amplitude (dots) for a radiation, measured at different input pulse repetition rates for a -thick . The solid line represents the fit [based on Eq. (2)]. The inset presents the real-time photoresponse, recorded for the -incident photon flux repletion rate.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Sensitivity and gigahertz counting performance of NbN superconducting single-photon detectors