Modeling Bias Current Flow in SQAs in the Presence of Magnetic Fields

Optimizing the Josephson junction critical currents across a parallel coupled Superconducting Quantum Interference Device (SQUID) Array (SQA) increases the performance over the case where all junctions have the same critical current, allowing for the operation of wider arrays in the parallel coupled...

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Bibliographic Details
Published inIEEE transactions on applied superconductivity Vol. 34; no. 3; pp. 1 - 4
Main Authors Berggren, Susan A. E., Crowe, Sean T., Greenough, Ryan D., Sanborn, Graham P., Ferrante, Nicholas B., Taylor, Benjamin J.
Format Journal Article
LanguageEnglish
Published New York IEEE 01.05.2024
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Arrays
Boundary conditions
Computational modeling
Critical current (superconductivity)
Josephson junctions
Junctions
Magnetic fields
Mathematical models
Nonuniformity
Optimization
SQUIDs
superconducting devices
Superconducting quantum interference devices
Transfer functions
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Summary:Optimizing the Josephson junction critical currents across a parallel coupled Superconducting Quantum Interference Device (SQUID) Array (SQA) increases the performance over the case where all junctions have the same critical current, allowing for the operation of wider arrays in the parallel coupled direction. We have previously modeled the current flow non-uniformity in zero magnetic field, however, in operation, the SQA will be biased in field to its optimal operating point on the anti-peak feature of the field-to-voltage transfer function. In this work we model the cross-sectional current distributions in a magnetic field. Initial simulations appear to confirm the current crowding predicted in previous work.
ISSN:1051-8223
1558-2515
DOI:10.1109/TASC.2024.3367807