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

• URL: http://arxiv.org/abs/2603.25258v1
• Date: Thu, 26 Mar 2026 10:01:01 GMT
• Title: Superconducting Parallel-Plate Resonators for the Detection of Single Electron Spins
• Abstract summary: multilayer superconducting microwave resonator with sub-Ohm impedance optimized for high coupling strength to single electron spins.<n>Design minimizes the magnetic far-field and therefore achieves a Purcell factor $F_P > 1015$.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• 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 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.

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