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| Autori principali: | , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| Soggetti: | |
| Accesso online: | https://arxiv.org/abs/2506.11923 |
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| _version_ | 1866909648593879040 |
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| author | Menold, Tobias Bertoluzza, Arianna Hildebrand, Patrick Gottschalk, Ann-Kathrin Braun, Daniel Fortágh, József Günther, Andreas |
| author_facet | Menold, Tobias Bertoluzza, Arianna Hildebrand, Patrick Gottschalk, Ann-Kathrin Braun, Daniel Fortágh, József Günther, Andreas |
| contents | This work investigates the behavior of a spin-exchange relaxation-free (SERF) magnetometer integrated into the feedback branch of a closed-loop control circuit, designed to actively suppress noise from a current source. In this configuration, the magnetometer bandwidth is enhanced by almost two orders of magnitude as compared to the open-loop setup. Incorporating an injection transformer, the proposed system effectively reduces current noise to below 3 nA/sqrt(Hz) over a broad frequency bandwidth, independent of DC-current offsets. Analysis of the system sensitivity reveals that the performance is currently limited by technical noise. If this were to be eliminated, the system would achieve a current sensing sensitivity on the order of few pA/sqrt(Hz), while maintaining perfect galvanic isolation from the target circuit. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2506_11923 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Bandwidth enhanced current noise suppression with a SERF magnetometer Menold, Tobias Bertoluzza, Arianna Hildebrand, Patrick Gottschalk, Ann-Kathrin Braun, Daniel Fortágh, József Günther, Andreas Quantum Physics This work investigates the behavior of a spin-exchange relaxation-free (SERF) magnetometer integrated into the feedback branch of a closed-loop control circuit, designed to actively suppress noise from a current source. In this configuration, the magnetometer bandwidth is enhanced by almost two orders of magnitude as compared to the open-loop setup. Incorporating an injection transformer, the proposed system effectively reduces current noise to below 3 nA/sqrt(Hz) over a broad frequency bandwidth, independent of DC-current offsets. Analysis of the system sensitivity reveals that the performance is currently limited by technical noise. If this were to be eliminated, the system would achieve a current sensing sensitivity on the order of few pA/sqrt(Hz), while maintaining perfect galvanic isolation from the target circuit. |
| title | Bandwidth enhanced current noise suppression with a SERF magnetometer |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2506.11923 |