Bosonic Error Correction with Fluxonium
Abstract
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 ± 70 μs 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 ± 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.
Related
- Bosonic quantum error correction with microwave cavities for quantum repeaters
- Error Correction Properties of Covariant Bosonic Encodings
- Single-tone drive-enhanced CROT gate for bosonic quantum error correction
- Bosonic quantum control with a weakly coupled fluxonium qubit
- Error-Correction Transitions in Finite-Depth Quantum Channels
BibTeX
@misc{jha2026bosonic,
title = {{Bosonic Error Correction with Fluxonium}},
author = {Shantanu R. Jha and Shoumik D. Chowdhury and Gabriele Rolleri and Anaida Ali and Lev-Arcady Sellem and Réouven Assouly and David Pahl and Lukas Pahl and Junyoung An and Farid Hassani and Hung-Yu Tsao and Chia-Chin Tsai and Aranya Goswami and Gabriel D. Cutter and Jeremie Boudreault and Jeffrey M. Gertler and Michael A. Gingras and Bethany M. Niedzielski and Jeffrey M. Knecht and Mollie E. Schwartz and Kyle Serniak and Jeffrey A. Grover and Baptiste Royer and Max Hays and William D. Oliver},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.26880},
eprint = {2609.26880},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.26880},
}
RIS
TY - UNPB
TI - Bosonic Error Correction with Fluxonium
AU - Shantanu R. Jha
AU - Shoumik D. Chowdhury
AU - Gabriele Rolleri
AU - Anaida Ali
AU - Lev-Arcady Sellem
AU - Réouven Assouly
AU - David Pahl
AU - Lukas Pahl
AU - Junyoung An
AU - Farid Hassani
AU - Hung-Yu Tsao
AU - Chia-Chin Tsai
AU - Aranya Goswami
AU - Gabriel D. Cutter
AU - Jeremie Boudreault
AU - Jeffrey M. Gertler
AU - Michael A. Gingras
AU - Bethany M. Niedzielski
AU - Jeffrey M. Knecht
AU - Mollie E. Schwartz
AU - Kyle Serniak
AU - Jeffrey A. Grover
AU - Baptiste Royer
AU - Max Hays
AU - William D. Oliver
PY - 2026
DA - 2026/09/30
PB - arXiv
DO - 10.48550/arxiv.2609.26880
UR - https://arxiv.org/abs/2609.26880
AB - 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 ± 70 μs 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 ± 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.
ER -