High Quality 3-Dimensional Aluminum Microwave Cavities
Applied Physics
2020-10-16 v1 Mesoscale and Nanoscale Physics
Quantum Physics
Abstract
We present a comprehensive study of internal quality factors in superconducting stub-geometry 3-dimensional cavities made of aluminum. We use wet etching, annealing and electrochemichal polishing to improve the as machined quality factor. We find that the dominant loss channel is split between two-level system loss and an unknown source with 60:40 proportion. A total of 17 cavities of different purity, resonance frequency and size were studied. Our treatment results in reproducible cavities, with ten of them showing internal quality factors above 80 million at a power corresponding to an average of a single photon in the cavity. The best cavity has an internal quality factor of 115 million at single photon level.
Cite
@article{arxiv.2006.02213,
title = {High Quality 3-Dimensional Aluminum Microwave Cavities},
author = {M. Kudra and J. Biznárová and F. Roudsari and J. J. Burnett and D. Niepce and S. Gasparinetti and B. Wickman and P. Delsing},
journal= {arXiv preprint arXiv:2006.02213},
year = {2020}
}