Bosonic Error Correction with Fluxonium

Bosonic quantum error correction (QEC) offers a hardware-efficient route to fault-tolerant quantum computing. To date, however, superconducting circuit implementations of bosonic codes have utilized centimeter-scale 3D microwave cavities controlled by fixed-frequency transmon qubits, with logical lifetimes limited by transmon bit-flip errors. Here, we realize bosonic QEC in a fully planar architecture by pairing a heavy fluxonium, whose $451 \pm 70~μ\mathrm{s}$ bit-flip lifetime exceeds that of any control qubit in previous demonstrations, with an on-chip Archimedean spiral resonator several orders of magnitude smaller in mode volume than prior 3D cavities. We prepare finite-energy Gottesman-Kitaev-Preskill (GKP) states and stabilize them using measurement-free error correction with rapid fluxonium reset, extending the logical lifetime by a factor of $1.59 \pm 0.05$. These results provide the first demonstration of resonator control using a weakly coupled fluxonium and, with it, the first realization of standalone bosonic QEC in a fully planar superconducting circuit architecture.

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Authors

Shantanu R. Jha; Shoumik D. Chowdhury; Gabriele Rolleri; Anaida Ali; Lev-Arcady Sellem; Réouven Assouly; David Pahl; Lukas Pahl; Junyoung An; Farid Hassani; Hung-Yu Tsao; Chia-Chin Tsai; Aranya Goswami; Gabriel D. Cutter; Jeremie Boudreault; Jeffrey M. Gertler; Michael A. Gingras; Bethany M. Niedzielski; Jeffrey M. Knecht; Mollie E. Schwartz; Kyle Serniak; Jeffrey A. Grover; Baptiste Royer; Max Hays; William D. Oliver

Published

Sep 22, 2026

Paper type

preprint

Source

Arxiv