Markov chain Monte Carlo Detector Tomography applied to a NbTiN nanobridge
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| Format: | Preprint |
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2025
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| _version_ | 1866911011212099584 |
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| author | Baalbergen, F. B. Zadeh, I. E. van Exter, M. P. de Dood, M. J. A. |
| author_facet | Baalbergen, F. B. Zadeh, I. E. van Exter, M. P. de Dood, M. J. A. |
| contents | We demonstrate the use of a flexible and highly accurate Markov chain Monte Carlo Quantum Detector Tomography method as a minimization algorithm to best describe the response of an efficient $120 nm$ wide NbTiN superconducting nanobridge single photon detector. Separation of the internal quantum efficiency and external quantum efficiency is possible due to the difference in saturation behavior of an ideal 1-photon threshold detector as compared to a detector with non-unity 1-photon internal quantum efficiency. From a statistical analysis of our measurements (at $T=4.23\pm0.01K$, $I=29.4\pm0.1μA$, $I/I_\text{switch}=0.90\pm0.01$) we find an external quantum efficiency $η=(1.60\pm0.05)\cdot10^{-6}$, a 1-photon internal quantum efficiency $p_1=0.568\pm0.008$ and unity multi-photon (2 or more) internal quantum efficiency. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2503_11430 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Markov chain Monte Carlo Detector Tomography applied to a NbTiN nanobridge Baalbergen, F. B. Zadeh, I. E. van Exter, M. P. de Dood, M. J. A. Quantum Physics Instrumentation and Detectors Optics We demonstrate the use of a flexible and highly accurate Markov chain Monte Carlo Quantum Detector Tomography method as a minimization algorithm to best describe the response of an efficient $120 nm$ wide NbTiN superconducting nanobridge single photon detector. Separation of the internal quantum efficiency and external quantum efficiency is possible due to the difference in saturation behavior of an ideal 1-photon threshold detector as compared to a detector with non-unity 1-photon internal quantum efficiency. From a statistical analysis of our measurements (at $T=4.23\pm0.01K$, $I=29.4\pm0.1μA$, $I/I_\text{switch}=0.90\pm0.01$) we find an external quantum efficiency $η=(1.60\pm0.05)\cdot10^{-6}$, a 1-photon internal quantum efficiency $p_1=0.568\pm0.008$ and unity multi-photon (2 or more) internal quantum efficiency. |
| title | Markov chain Monte Carlo Detector Tomography applied to a NbTiN nanobridge |
| topic | Quantum Physics Instrumentation and Detectors Optics |
| url | https://arxiv.org/abs/2503.11430 |