High-$Q$ Superconducting Lumped-Element Resonators for Low-Mass Axion Searches

Low-frequency superconducting lumped-element resonators have recently attracted significant attention in the context of axion dark matter searches.

Here we present the design and implementation of a fixed-frequency superconducting resonator operating near 250 kHz, possessing an inductor volume of approximately 1 liter and achieving an unloaded quality factor $Q \approx 2.1\times10^{6}$.

This resonator represents a significant improvement over the state of the art and informs the design of searches for low-mass axions.