Nonlinear response of telecom-wavelength superconducting single-photon detectors
- URL: http://arxiv.org/abs/2407.20682v1
- Date: Tue, 30 Jul 2024 09:23:59 GMT
- Title: Nonlinear response of telecom-wavelength superconducting single-photon detectors
- Authors: Patrick Mark, Sebastian Gstir, Julian Münzberg, Gregor Weihs, Robert Keil,
- Abstract summary: We measure the nonlinearity of a telecom-wavelength superconducting nanowire single-photon detector via incoherent beam combination.
At typical photon count rates and detector bias current, the observed relative deviation from a perfectly linear response is in the order of 0.1% when the flux is doubled.
- Score: 0.0
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: We measure the nonlinearity of a telecom-wavelength superconducting nanowire single-photon detector via incoherent beam combination. At typical photon count rates and detector bias current, the observed relative deviation from a perfectly linear response is in the order of 0.1% when the flux is doubled. This arises from a balance between the counteracting nonlinearities of deadtime-induced detector saturation and of multi-photon detections. The observed behaviour is modelled empirically, which suffices for a correction of measured data. In addition, statistical simulations, taking into account the measured recovery of the detection efficiency, provide insight into possible mechanisms of multi-photon detection.
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