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Robust multimode superconducting circuit optimized for quantum information processing

Pablo García-Azorín1,2,*, Francisco A. Cárdenas-López3, Gerhard B. P. Huber4,5, Guillermo Romero6, Max Werninghaus4,5, Felix Motzoi3,7, Stefan Filipp4,5,8, and Mikel Sanz1,2,9,10

  • *Corresponding author: pablo.garciaa@ehu.eus
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Phys. Rev. Applied 26, 014081 – Published 24 July, 2026

DOI: https://doi.org/10.1103/ksnb-vhsl

Abstract

Multimode superconducting circuits offer a promising platform for engineering robust systems for quantum computation. Previous studies indicate that single-mode devices cannot be engineered to simultaneously exhibit resilience against multiple decoherence sources due to conflicting requirements. In contrast, multimode systems offer increased flexibility and have proven capable of overcoming these fundamental limitations. Here, we present a multimode device optimized for quantum information processing. It features an anharmonicity of a third of the qubit frequency and reduced energy dispersion caused by charge and magnetic flux fluctuations. It exhibits improvements over the fundamental errors limiting transmon and fluxonium coherence and control, achieving ratios between the total coherence time and the gate time T2/tg one order of magnitude larger than transmon and two times larger than fluxonium for microwave charge drives, assuming equal dielectric and inductive loss quality factors and limited drive strength. Simulations further demonstrate the device’s robustness to circuit parameter deviations, a known limitation of many multimode devices.

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Phys. Rev. Applied 26, 014081– Published 24 July, 2026
  • Received 10 September 2024
  • Revised 8 March 2026
  • Accepted 23 June 2026
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