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Superconducting Parallel-Plate Resonators for the Detection of Single Electron Spins

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arXiv:2603.25258v1 Announce Type: new Abstract: We introduce a multilayer superconducting microwave resonator with sub-Ohm impedance optimized for high coupling strength to single electron spins. The design minimizes the magnetic far-field and therefore achieves a Purcell factor $F_P > 10^{15}$. We show several ways to fabricate this type of resonator and present resonators with an intrinsic $Q$-factor exceeding $2 \cdot 10^4$ at the single-photon level. We further characterize these resonators

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Quantum Physics [Submitted on 26 Mar 2026] Superconducting Parallel-Plate Resonators for the Detection of Single Electron Spins André Pscherer, Jannes Liersch, Patrick Abgrall, Andrew D. Beyer, Fabien Defrance, Sunil R. Gowala, Hélène Le Sueur, James O'Sullivan, Emmanuel Flurin, Patrice Bertet We introduce a multilayer superconducting microwave resonator with sub-Ohm impedance optimized for high coupling strength to single electron spins. The design minimizes the magnetic far-field and therefore achieves a Purcell factor F_P > 10^{15}. We show several ways to fabricate this type of resonator and present resonators with an intrinsic Q-factor exceeding 2 \cdot 10^4 at the single-photon level. We further characterize these resonators in magnetic fields up to 500 \, \text{mT}. Finally, we evaluate the impact of the achievable Purcell factor on single-spin detection through photon counting and dispersive readout. Comments: 12 pages, 7 figures, plus supplementary material of 5 pages, 4 figures Subjects: Quantum Physics (quant-ph) Cite as: arXiv:2603.25258 [quant-ph] (or arXiv:2603.25258v1 [quant-ph] for this version) https://doi.org/10.48550/arXiv.2603.25258 Focus to learn more Submission history From: André Pscherer [view email] [v1] Thu, 26 Mar 2026 10:01:01 UTC (26,220 KB) Access Paper: HTML (experimental) view license Current browse context: quant-ph < prev | next > new | recent | 2026-03 References & Citations INSPIRE HEP NASA ADS Google Scholar Semantic Scholar Export BibTeX Citation Bookmark Bibliographic Tools Bibliographic and Citation Tools Bibliographic Explorer Toggle Bibliographic Explorer (What is the Explorer?) Connected Papers Toggle Connected Papers (What is Connected Papers?) Litmaps Toggle Litmaps (What is Litmaps?) scite.ai Toggle scite Smart Citations (What are Smart Citations?) Code, Data, Media Demos Related Papers About arXivLabs Which authors of this paper are endorsers? | Disable MathJax (What is MathJax?)

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