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Investigating pump harmonics generation in a SNAIL-based Traveling Wave Parametric Amplifier

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arxiv 2405.20096 v3 pith:6A3G5GRD submitted 2024-05-30 quant-ph

A. Yu. Levochkina , H. G. Ahmad , P. Mastrovito , I. Chatterjee , G.Serpico , L. Di Palma , R. Ferroiuolo , R. Satariano
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P. Darvehi A. Ranadive G. Cappelli G. Le Gal L. Planat D. Montemurro D. Massarotti F.Tafuri N. Roch G. P. Pepe M. Esposito
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keywords harmonicsgenerationamplificationbehaviourbroadbandjosephsonnonlinearparametric
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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 SNAIL (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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  1. Josephson Traveling-Wave Parametric Amplifier with Inverse Kerr Phase Matching

    quant-ph 2025-07 conditional novelty 5.0 of 10

    A JTWPA using flux-tunable negative Kerr nonlinearity to balance chromatic dispersion achieves 20 dB gain over 3 GHz with near-quantum-limited noise.

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