Nonlinear response of telecom-wavelength superconducting single-photon detectors
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arXiv
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| Main Authors: | , , , , |
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| Format: | Preprint |
| Published: |
2024
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| _version_ | 1866913579603591168 |
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| author | Mark, Patrick Gstir, Sebastian Münzberg, Julian Weihs, Gregor Keil, Robert |
| author_facet | Mark, Patrick Gstir, Sebastian Münzberg, Julian Weihs, Gregor Keil, Robert |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2407_20682 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Nonlinear response of telecom-wavelength superconducting single-photon detectors Mark, Patrick Gstir, Sebastian Münzberg, Julian Weihs, Gregor Keil, Robert Quantum Physics Instrumentation and Detectors 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. |
| title | Nonlinear response of telecom-wavelength superconducting single-photon detectors |
| topic | Quantum Physics Instrumentation and Detectors |
| url | https://arxiv.org/abs/2407.20682 |