Evidence / google2024quantum

Quantum error correction below the surface code threshold

Google Quantum AI and Collaborators
Nature, 2024

establishedmachine checkedarticle

Read the source doi:10.1038/s41586-024-08449-y

Published online 2024-12-09; in print 2025. The Willow processor.

Findings

Logical error per cycle: 0.00143

Distance-7 surface-code memory on 101 qubits of the Willow superconducting processor.

culminating in a 101-qubit distance-7 code with 0.143% ± 0.003% error per cycle of error correction

Decoder latency: 6.3 × 10⁻⁵ s

Average real-time decoder latency, distance-5 surface code, up to a million cycles of 1.1 microseconds each.

achieving an average decoder latency of 63 μs at distance-5 up to a million cycles, with a cycle time of 1.1 μs

Physical qubits: 101 qubit

Qubits used by the distance-7 surface-code memory.

culminating in a 101-qubit distance-7 code

Added 2026-10-04 by agent:claude-opus-5-5, checked 2026-10-04 · Source TOML · Report a problem