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Superconducting high kinetic inductance elements constitute a valuableresource for quantum circuit design and millimeter-wave detection. Granularaluminum (GrAl) in the superconducting regime is a particularly interestingmaterial since it has already shown a kinetic inductance in the range ofnH$/\Box$ and its deposition is compatible with conventional Al/AlOx/AlJosephson junction fabrication. We characterize microwave resonators fabricatedfrom GrAl with a room temperature resistivity of $4 \times10^3\,\mu\Omega\cdot$cm, which is a factor of 3 below the superconductor toinsulator transition, showing a kinetic inductance fraction close to unity. Themeasured internal quality factors are on the order of $Q_{\mathrm{i}} = 10^5$in the single photon regime, and we demonstrate that non-equilibriumquasiparticles (QP) constitute the dominant loss mechanism. We extract QPrelaxation times in the range of 1 s and we observe QP bursts every $\sim 20$s. The current level of coherence of GrAl resonators makes them attractive forintegration in quantum devices, while it also evidences the need to reduce thedensity of non-equilibrium QPs.

Quasiparticle dynamics in granular aluminum close to the superconductor to insulator transition