Characterizing and Optimizing Qubit Coherence Based on SQUID Geometry

Author(s)
Braumüller, Jochen; Ding, Leon; Vepsäläinen, Antti P; Sung, Youngkyu; Kjaergaard, Morten; ... Show more
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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.
Date issued
2020
URI
https://hdl.handle.net/1721.1/133728
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
Journal
Physical Review Applied
Publisher
American Physical Society (APS)
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