Multimodal scanning single-spin quantum sensing of an on-chip superconducting resonator

Hybrid quantum platforms that integrate materials with diverse physical properties and tunable interactions offer a compelling path toward scalable quantum technologies. In this study, we demonstrate a hybrid system combining a single nitrogen-vacancy (NV) center spin qubit with an on-chip superconducting microwave resonator, leveraging their complementary quantum characteristics. We report evidence of enhanced NV spin relaxation driven by the superconductor, exhibiting a Hebel-Slichter-like feature near the superconducting transition. In the strong coupling regime, we show that the resonator mode can coherently drive NV Rabi oscillations, indicating active spin-photon interaction. Furthermore, by employing scanning NV magnetometry, we directly image the resonator's local electromagnetic response, revealing nanoscale vortex dynamics and the evolution of superconducting features in real space. These findings establish a versatile platform for exploring spin-resonator interactions and open new avenues for the design and diagnostics of compact superconducting quantum devices