B Grade B
Quantinuum H2: Two-qubit gate fidelity
99.843% %
As stated in the source: “99.843(5)% two-qubit gate fidelity (per-gate error 1.57(5) x 10^-3)”
Uncertainty: 99.838 to 99.848 (Stated as 99.843(5)%).
Caveats
Component-level figure from the gate zones, not a full-system benchmark. Journal page returned 403; value read from arXiv abstract and HTML full text.
- Set-up
- 56-qubit configuration. 2Q RB on the eight gate-zone qubits with standard Clifford randomization
- Method
- Two-qubit Clifford randomized benchmarking, Clifford error scaled to per native UZZ(pi/2) gate
- Compared only with
- results in the group “mean”
- Measured
- Not stated
- Published
- 2025
- Measured by
- Quantinuum
- Independent of the maker
- No
- Peer-reviewed
- Yes
- Repeated by others
- Not yet
Source
The computational power of random quantum circuits in arbitrary geometries, Physical Review X 15, 021052 (2025) (arXiv:2406.02501). Peer-reviewed paper. DOI: 10.1103/PhysRevX.15.021052
Comparable results
| Machine | Value | Set-up | Published | Measured by | Grade | Record |
|---|---|---|---|---|---|---|
| Quantinuum Helios | 99.921% | mean | 17 Jun 2026 | Maker | B | r-000017 |
| Google Willow | 99.67% | mean | 9 Dec 2024 | Maker | B | r-000005 |
| Google Willow | 99.86% | mean | 9 Dec 2024 | Maker | B | r-000006 |
| QuEra Computing Harvard–MIT rubidium atom array | 99.54% | mean | 11 Oct 2023 | Maker | B | r-000032 |
History
- 27 October 2026: added
Spotted a mistake? Report an error, quoting r-000023.