We present measurements and simulations of superconducting Nb co-planar waveguide resonators on sapphire substrate down to millikelvin temperature range with different readout powers. In the high temperature regime, we demonstrate that the Nb film residual surface resistance is comparable to that observed in the ultra-high quality, bulk Nb 3D superconducting radio frequency cavities while the resonator quality is dominated by the BCS thermally excited quasiparticles. At low temperature both the resonator quality factor and frequency can be well explained using the two-level system models. Through the energy participation ratio simulations, we find that the two-level system loss tangent is ∼10−2, which agrees quite well with similar studies performed on the Nb 3D cavities.
@article{arxiv.2207.13024,
title = {High quality superconducting Nb co-planar resonators on sapphire substrate},
author = {S. Zhu and F. Crisa and M. Bal and A. A. Murthy and J. Lee and Z. Sung and A. Lunin and D. Frolov and R. Pilipenko and D. Bafia and A. Mitra and A. Romanenko and A. Grassellino},
journal= {arXiv preprint arXiv:2207.13024},
year = {2022}
}