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Comparative Study of Numerical Modeling Methods for a Flux-Pumped Josephson Parametric Amplifier | IEEE Journals & Magazine | IEEE Xplore

Comparative Study of Numerical Modeling Methods for a Flux-Pumped Josephson Parametric Amplifier


Abstract:

Quantum-limited noise amplifiers based on superconducting Josephson junction elements are essential components for measuring low-power signals in a wide range of applicat...Show More

Abstract:

Quantum-limited noise amplifiers based on superconducting Josephson junction elements are essential components for measuring low-power signals in a wide range of applications. The gain bandwidth of a flux-pumped Josephson parametric amplifier can be broadened by coupling junction elements with an impedance-matching network. Well-known modeling methods for these amplifiers typically assume ideal lumped-element circuits for passive components, but often overlook unexpected resonant modes arising from the bulk geometric features. To address this challenge, flux-pumped junction elements can be simulated using finite-element analysis (FEA) combined with the pumpistor modeling method, which accurately accounts for the geometric features of arbitrary impedance-matching circuits. Here, we present a benchmark study using a circuit topology to compare different modeling methods: (1) the coupled mode network method, (2) the harmonic balance method, (3) the analytical pumpistor method, and (4) the FEA-assisted pumpistor method. Our results highlight the importance of accurately reflecting geometric features to prevent unexpected resonant modes and avoid detuning from the target flux bias values.
Published in: IEEE Transactions on Applied Superconductivity ( Volume: 35, Issue: 5, August 2025)
Article Sequence Number: 1701006
Date of Publication: 03 March 2025

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