Characterizing and Optimizing Qubit Coherence Based on SQUID Geometry
Name
PhysRevApplied.13.054079.pdf
Description
Published version
Size
1.37 MB
Format
Adobe PDF
Checksum (MD5)
8101c662840db8d3371791fa53cdab3f
Author(s)
Braumüller, Jochen
Ding, Leon
Vepsäläinen, Antti P
Sung, Youngkyu
Kjaergaard, Morten
Menke, Tim
Winik, Roni
Kim, David
Niedzielski, Bethany M
Melville, Alexander
Date Issued
2020
Journal
Physical Review Applied
Publisher
American Physical Society (APS)
Version
Final published version
Abstract
© 2020 American Physical Society. The dominant source of decoherence in contemporary frequency-tunable superconducting qubits is 1/f 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 superconducting quantum interference device (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.
MIT Department
Massachusetts Institute of Technology. Research Laboratory of Electronics
Massachusetts Institute of Technology. Department of Physics
Lincoln Laboratory
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
Terms of Use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1103/PHYSREVAPPLIED.13.054079
