Investigating pump harmonics generation in a SNAIL-based traveling wave parametric amplifier
Abstract Traveling wave parametric amplifiers (TWPAs) are extensively employed in experiments involving weak microwave signals for their highly desirable quantum-limited and broadband characteristics. However, TWPAs’ broadband nature comes with the disadvantage of admitting the activation of spuriou...
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Published in | Superconductor science & technology Vol. 37; no. 11; pp. 115021 - 115032 |
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Main Authors | , , , , , , , , , , , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
IOP Publishing
01.11.2024
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Subjects | |
Online Access | Get full text |
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Summary: | Abstract Traveling wave parametric amplifiers (TWPAs) are extensively employed in experiments involving weak microwave signals for their highly desirable quantum-limited and broadband characteristics. However, TWPAs’ broadband nature comes with the disadvantage of admitting the activation of spurious nonlinear processes, such as harmonics generation, that can potentially degrade amplification performance. Here we experimentally investigate a Josephson TWPA device with superconducting nonlinear asymmetric inductive element-based unit cells focusing on the amplification behaviour along with the generation of second and third harmonics of the pump. By comparing experimental results with transient numerical simulations, we demonstrate the influence of Josephson junctions’ fabrication imperfections on the occurrence of harmonics and on the gain behaviour. |
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Bibliography: | SUST-106440.R1 |
ISSN: | 0953-2048 1361-6668 |
DOI: | 10.1088/1361-6668/ad8314 |