Time Domain Design of a Josephson Parametric Amplifier and Comparison with Input Output Theory

• URL: http://arxiv.org/abs/2508.18396v1
• Date: Mon, 25 Aug 2025 18:37:11 GMT
• Title: Time Domain Design of a Josephson Parametric Amplifier and Comparison with Input Output Theory
• Authors: Emre Küçükyılmaz, Mehmet Ünlü, Ali Bozbey,
• Abstract summary: Quantum-limited amplifiers are essential components in quantum computers.<n>In JPAs, amplification is based on the nonlinear properties of Josephson Junctions.<n>We propose an alternative approach based on an equivalent circuit model of JPAs, implemented using open-source Josephson circuit simulrs.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Quantum-limited amplifiers, such as Josephson Traveling Wave Parametric Amplifiers (JTWPAs) and Joseph- son Parametric Amplifiers (JPAs), are essential components in quantum computers. They amplify low-power microwave signals from qubits at the 10 mK stage before further amplification at the 4 K stage using HEMT amplifiers. In JPAs, parametric amplification is based on the nonlinear properties of Josephson Junctions. While JPAs are typically designed and analyzed using input-output theory based on quantum physics, we propose an alternative approach based on an equivalent circuit model of JPAs, implemented using open-source Josephson circuit simula- tors. We compare the results with those obtained from input- output theory. This method enables the use of circuit optimizers for various objective functions and significantly reduces design time compared to quantum theory-based approaches.

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