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| Main Authors: | , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2511.14313 |
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| _version_ | 1866917088738672640 |
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| author | Tjøtta, Maxim Shah, Devashish Modi, Kanishk Valentini, Marco Souto, Rubén Seoane Katsaros, Georgios Danon, Jeroen |
| author_facet | Tjøtta, Maxim Shah, Devashish Modi, Kanishk Valentini, Marco Souto, Rubén Seoane Katsaros, Georgios Danon, Jeroen |
| contents | Extracting the current-phase relationship (CPR) of a single superconducting junction is challenging in practice and traditionally involves embedding the junction in a larger superconducting circuit containing SQUIDs and/or resonators. Applying ac driving to the junction has proven to be a viable and less invasive way to extract information about the few lowest harmonics of the CPR, by locating the integer and fractional Shapiro steps in the IV-curve of the driven junction. Here, we present an alternative driving-based method that allows to extract the full harmonic content of a CPR in a non-invasive way, by fitting the measured critical currents of the driven junction as a function of driving power. We test our method, both using numerical simulations and in experiments, and we show that it works very accurately, also in the presence of noise. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2511_14313 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Full Shapiro spectroscopy of current-phase relationships Tjøtta, Maxim Shah, Devashish Modi, Kanishk Valentini, Marco Souto, Rubén Seoane Katsaros, Georgios Danon, Jeroen Superconductivity Mesoscale and Nanoscale Physics Extracting the current-phase relationship (CPR) of a single superconducting junction is challenging in practice and traditionally involves embedding the junction in a larger superconducting circuit containing SQUIDs and/or resonators. Applying ac driving to the junction has proven to be a viable and less invasive way to extract information about the few lowest harmonics of the CPR, by locating the integer and fractional Shapiro steps in the IV-curve of the driven junction. Here, we present an alternative driving-based method that allows to extract the full harmonic content of a CPR in a non-invasive way, by fitting the measured critical currents of the driven junction as a function of driving power. We test our method, both using numerical simulations and in experiments, and we show that it works very accurately, also in the presence of noise. |
| title | Full Shapiro spectroscopy of current-phase relationships |
| topic | Superconductivity Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2511.14313 |