B Grade B
Google Willow: Logical error rate
0.011 error per cycle
As stated in the source: “ε5 = 0.0110(2) per cycle (distance-5 color code)”
Uncertainty: 0.0108 to 0.0112 (Stated as 0.0110(2); the type of interval is not stated in the part read.).
Caveats
Different, smaller Willow chip (72 qubits) from the 105-qubit Willow on the spec sheet. Quantum memory result; error suppression from distance 3 to 5 was only Λ = 1.56(4), weaker than the surface code result.
- Set-up
- 72-qubit Willow-generation chip. Distance-5 color code logical qubit using 19 data qubits and 18 auxiliary qubits (37 physical qubits) on a 72-qubit Willow processor.
- Method
- Color code memory, logical error per cycle, neural-network decoder (AlphaQubit)
- Compared only with
- results in the group “color code d5 memory”
- Measured
- Not stated
- Published
- 26 May 2025
- Measured by
- Google Quantum AI
- Independent of the maker
- No
- Peer-reviewed
- Yes
- Repeated by others
- Not yet
Source
Scaling and logic in the color code on a superconducting quantum processor, Nature (Springer Nature); preprint arXiv:2412.14256. Peer-reviewed paper. DOI: 10.1038/s41586-025-09061-4
History
- 27 October 2026: added
Spotted a mistake? Report an error, quoting r-000003.