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Trapped Ion Quantum Computing Superconducting Qubits

FerBo: a noise resilient qubit hybridizing Andreev and fluxonium states

arXiv

Authors: J. J. Caceres, D. Sanz Marco, J. Ortuzar, E. Flurin, C. Urbina, H. Pothier, M. F. Goffman, F. J. Matute-Cañadas, A. Levy Yeyati

Year

2026

Paper ID

38742

Status

Preprint

Abstract Read

~2 min

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Abstract

We propose a novel superconducting quantum circuit that should be robust against both relaxation and dephasing over a wide and experimentally accessible parameter range. The circuit consists of a parallel arrangement of a large inductance, a small capacitor, and a well-transmitting Josephson weak link. Protection against relaxation arises from the hybridization between the fermionic degree of freedom associated with Andreev levels in the weak link and the bosonic electromagnetic mode of the LC circuit, hence its name: FerBo. Furthermore, as in the fluxonium qubit, delocalization of the wavefunctions in phase space provides resilience against dephasing.

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We propose a novel superconducting quantum circuit that should be robust against both relaxation and dephasing over a wide and experimentally accessible parameter range.

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References & Citation Signals

[1] DOI https://doi.org/arXiv:2604.01145 [2] arXiv https://arxiv.org/abs/2604.01145 [3] Publisher https://arxiv.org/abs/2604.01145

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