Granular aluminum is a promising material for high kinetic inductance devices such as qubit circuits. It has the advantage over atomically disordered materials such as NbN_x, to maintain a high kinetic inductance concomitantly with a high quality factor. We show that high quality nano-scale granular aluminum films having a sharp superconducting transition with normal state resistivity values of the order of 1x10^5 \mu\Omega cm and kinetic inductance values of the order of 10 nH/sq can be obtained, surpassing state of the art values. We argue that this is a result of the different nature of the metal-to-insulator transition, being electronic correlations driven (Mott type) in the former and disorder driven (Anderson type) in the latter.
@article{arxiv.2008.02860,
title = {Granular superconductors for high kinetic inductance and low loss quantum devices},
author = {Aviv Glezer Moshe and Eli Farber and Guy Deutscher},
journal= {arXiv preprint arXiv:2008.02860},
year = {2020}
}
Comments
The following article has been accepted by Applied Physics Letters. After it is published, it will be found at http://apl.aip.org/