Modeling Josephson traveling-wave parametric amplifiers with electromagnetic and circuit co-simulation

• URL: http://arxiv.org/abs/2509.07807v1
• Date: Tue, 09 Sep 2025 14:46:05 GMT
• Title: Modeling Josephson traveling-wave parametric amplifiers with electromagnetic and circuit co-simulation
• Authors: Likai Yang, Jennifer Wang, Mohamed Awida Hassan, Philip Krantz, Kevin P. O'Brien,
• Abstract summary: We present efficient and accurate modeling of a Josephson traveling-wave parametric amplifier (JTWPA) based on electromagnetic (EM) and circuit co-simulation.
• Score: 4.431858977797275
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Optimizing the performance of cryogenic quantum amplifiers is a key step toward achieving high-fidelity and scalable qubit readout. In this work, we present efficient and accurate modeling of a Josephson traveling-wave parametric amplifier (JTWPA) based on electromagnetic (EM) and circuit co-simulation. In contrast to conventional simulation methods where an equivalent lumped-element circuit model of the JTWPA is required, we directly perform full EM analysis of the device to faithfully determine the linear response. The extracted S-parameters are then fed into a nonlinear harmonic balance simulator with Josephson junctions represented as circuit elements. The simulated linear and gain properties are compared with experimental results and show good agreement.

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