B Grade B
QuEra Computing Harvard–MIT rubidium atom array: Two-qubit gate fidelity
99.54% %
As stated in the source: “FCZ = 99.54(2)% (time-optimal CZ, 20 atoms / 10 gate sites in parallel)”
Uncertainty: 99.52 to 99.56 (Stated as 99.54(2)%; paper says error bars are 68% confidence intervals).
Caveats
Research system, not a commercial QuEra product. Benchmarking uses only global rotations, which the authors note makes it less sensitive to some error types. Gate fidelity, not a whole-system benchmark.
- Set-up
- CZ gates on 10 pairs (20 atoms) in parallel, up to 20 CZ gates with random global single-qubit rotations. Same gate on 60 atoms in parallel gave 99.48(2)%; smooth-amplitude gate 99.55(3)%; Bell-state method 99.52(4)%.
- Method
- Global randomized benchmarking (random global single-qubit rotations between CZ gates); cross-checked by repeated-CZ Bell-state method
- Compared only with
- results in the group “mean”
- Measured
- Not stated
- Published
- 11 October 2023
- Measured by
- Harvard University, MIT and QuEra Computing (Lukin group collaboration)
- Independent of the maker
- No
- Peer-reviewed
- Yes
- Repeated by others
- Not yet
Source
High-fidelity parallel entangling gates on a neutral atom quantum computer, Nature 622, 268-272 (2023); preprint arXiv:2304.05420. Peer-reviewed paper. DOI: 10.1038/s41586-023-06481-y
Comparable results
| Machine | Value | Set-up | Published | Measured by | Grade | Record |
|---|---|---|---|---|---|---|
| Quantinuum Helios | 99.921% | mean | 17 Jun 2026 | Maker | B | r-000017 |
| Quantinuum H2 | 99.843% | mean | 2025 | Maker | B | r-000023 |
| Google Willow | 99.67% | mean | 9 Dec 2024 | Maker | B | r-000005 |
| Google Willow | 99.86% | mean | 9 Dec 2024 | Maker | B | r-000006 |
History
- 27 October 2026: added
Spotted a mistake? Report an error, quoting r-000032.