Bosonic Error Correction with Fluxonium

First standalone bosonic quantum-error-correction demonstration in a fully planar superconducting circuit, using a heavy-fluxonium ancilla to control and stabilize finite-energy GKP states in an on-chip Archimedean spiral resonator.

Key Results

• Heavy-fluxonium bit-flip lifetime: $451\pm 70\mu \mathrm{s}$
• Measurement-free GKP error correction with rapid fluxonium reset
• Pauli-averaged logical-lifetime enhancement: $1.59\pm 0.05$
• First resonator control with a weakly coupled fluxonium and first standalone bosonic QEC in a fully planar superconducting architecture

Links

• arXiv: 2609.26880

Verification

Author order was checked against the arXiv v2 PDF title page on 2026-10-14.

Zoo Links

• bosonic-qubit
• fluxonium
• gkp-codes