B Grade B
Google Willow: Cross-entropy benchmarking
1 × 10⁻³ fidelity
As stated in the source: “XEB fidelity = 0.1% at 103 qubits, depth 40”
Caveats
Vendor spec sheet with no uncertainty given. At this scale the XEB fidelity cannot be checked by full classical simulation; it is an estimate. The spec sheet's claim of 5 minutes on Willow vs 10^25 years classically is a separate estimate not recorded here.
- Set-up
- Random circuits on 103 qubits, depth 40, on Willow Chip 2 (mean simultaneous two-qubit iSWAP-like error 0.14%).
- Method
- Linear cross-entropy benchmarking on random circuit sampling
- Compared only with
- results in the group “103 qubits depth 40”
- Measured
- Not stated
- Published
- 9 December 2024
- Measured by
- Google Quantum AI
- Independent of the maker
- No
- Peer-reviewed
- No
- Repeated by others
- Not yet
Source
Willow Spec Sheet, Google Quantum AI. Company technical document.
History
- 27 October 2026: added
Spotted a mistake? Report an error, quoting r-000004.