Characterizing and optimizing qubit coherence based on SQUID geometry
Quantum Physics
2020-07-01 v1 Mesoscale and Nanoscale Physics
Abstract
The dominant source of decoherence in contemporary frequency-tunable superconducting qubits is 1/ flux noise. To understand its origin and find ways to minimize its impact, we systematically study flux noise amplitudes in more than 50 flux qubits with varied SQUID geometry parameters and compare our results to a microscopic model of magnetic spin defects located at the interfaces surrounding the SQUID loops. Our data are in agreement with an extension of the previously proposed model, based on numerical simulations of the current distribution in the investigated SQUIDs. Our results and detailed model provide a guide for minimizing the flux noise susceptibility in future circuits.
Keywords
Cite
@article{arxiv.2002.09372,
title = {Characterizing and optimizing qubit coherence based on SQUID geometry},
author = {Jochen Braumüller and Leon Ding and Antti Vepsäläinen and Youngkyu Sung and Morten Kjaergaard and Tim Menke and Roni Winik and David Kim and Bethany M. Niedzielski and Alexander Melville and Jonilyn L. Yoder and Cyrus F. Hirjibehedin and Terry P. Orlando and Simon Gustavsson and William D. Oliver},
journal= {arXiv preprint arXiv:2002.09372},
year = {2020}
}
Comments
14 pages, 6 figures