Microresonators fabricated from high-kinetic-inductance Aluminum films
arXiv:1807.00210 · doi:10.1103/PhysRevApplied.11.011003
Abstract
We have studied superconducting coplanar-waveguide (CPW) resonators fabricated from disordered (granular) films of Aluminum. Very high kinetic inductance of these films, inherent to disordered materials, allows us to implement ultra-short (200 m at a 5GHz resonance frequency) and high-impedance (up to 5 k) half-wavelength resonators. We have shown that the intrinsic losses in these resonators at temperatures mK are limited by resonator coupling to two-level systems in the environment. The demonstrated internal quality factors are comparable with those for CPW resonators made of conventional superconductors. High kinetic inductance and well-understood losses make these disordered Aluminum resonators promising for a wide range of microwave applications which include kinetic inductance photon detectors and superconducting quantum circuits.
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