![]() and have led to substantial advances in the detection limit of electron spin resonance. Superconducting resonators inductively coupled to atomic impurity spins form the basis of proposals for spin-based quantum memories 10–14 10. and the coupling of distinct physical systems. Superconducting coplanar microwave resonators allow for a variety of compact designs, in conjunction with high-quality factors, and find applications in the sensitive readout of individual quantum systems and small ensembles 1–7 1. We achieve a continuous tuning of up to 30 MHz by rotating the magnetic field vector, introducing a component of 5 mT perpendicular to the superconductor. The resonator maintains a quality factor of >10 5 up to magnetic fields of 2.6 T, applied predominantly in the plane of the superconductor. Here, we demonstrate a high-quality, magnetic field resilient superconducting resonator, using a 3D vector magnet to continuously tune its resonance frequency by adjusting the orientation of the magnetic field. In order to be able to couple high-Q superconducting resonators to such specific spin transitions, it is necessary to be able to tune the resonator frequency under a constant magnetic field amplitude. Certain spin systems that are promising for such quantum memories possess “sweet spots” at particular combinations of magnetic fields and frequencies, where spin coherence times or linewidths become particularly favorable. ![]() Superconducting resonators interfaced with paramagnetic spin ensembles are used to increase the sensitivity of electron spin resonance experiments and are key elements of microwave quantum memories. ![]()
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