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 μm at a 5GHz resonance frequency) and high-impedance (up to 5 kΩ) half-wavelength resonators. We have shown that the intrinsic losses in these resonators at temperatures ≲250 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.
@article{arxiv.1807.00210,
title = {Microresonators fabricated from high-kinetic-inductance Aluminum films},
author = {Wenyuan Zhang and K. Kalashnikov and Wen-Sen Lu and P. Kamenov and T. DiNapoli and M. E. Gershenson},
journal= {arXiv preprint arXiv:1807.00210},
year = {2019}
}