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  • Open Access

Efficient control of fluxonium qubits via nonadiabatic transitions

I-Yun Hsiao1,*, Yen-Hsiang Lin2,3,†, and Yoshiaki Teranishi4,‡

  • *Contact author: win820804@gmail.com
  • †Contact author: yhlin@phys.nthu.edu.tw
  • ‡Contact author: tera@nycu.edu.tw
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Phys. Rev. Research 7, 033183 – Published 22 August, 2025

DOI: https://doi.org/10.1103/4s4k-rf6x

Abstract

The fluxonium qubit is a promising platform for quantum operations due to its large anharmonicity and long coherence time. However, conventional resonant driving methods often require long operation times and complex implementation. As an alternative, nonadiabatic transitions induced by a time-dependent external flux ϕext(t) can enable faster and simpler control by exploiting quantum interference between multiple transition paths. Existing approaches typically impose periodicity or symmetry on ϕext(t), which can limit control efficiency. We propose a design strategy for ϕext(t) that relaxes these constraints. We demonstrate the effectiveness of this approach in two key scenarios: population inversion and adiabatic passage. Numerical simulations show that our method achieves higher control efficiency than existing schemes, emphasizing the advantage of breaking periodicity and symmetry. Furthermore, by incorporating decoherence effects using the Lindblad master equation, we confirm that the proposed scheme remains robust under realistic conditions.

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Phys. Rev. Research 7, 033183– Published 22 August, 2025
  • Received 22 May 2025
  • Accepted 30 July 2025
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

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