B Grade B
IonQ Oxford Ionics two-qubit prototype: Two-qubit gate fidelity
99.9916% %
As stated in the source: “estimated two-qubit gate error 8.4(7) x 10^-5 (fidelity >99.99%)”
Uncertainty: 99.9909 to 99.9923 (converted from the stated error and its uncertainty).
Caveats
Two-qubit lab prototype, not a product system. Preprint. Described as an 'estimated' error; SPAM assumed negligible. Not comparable to system-wide averages on full machines. Converted from the stated error of 8.4(7)×10⁻⁵.
- Set-up
- Two-qubit test setup, sequences up to N=200 Cliffords; SPAM assumed negligible (no y-offset in fit); above the Doppler limit
- Method
- Subspace Leakage Error Randomized Benchmarking (SLERB), 'smooth gate' without ground-state cooling
- Compared only with
- results in the group “single pair”
- Measured
- Not stated
- Published
- 20 October 2025
- Measured by
- Oxford Ionics (an IonQ company)
- Independent of the maker
- No
- Peer-reviewed
- No
- Repeated by others
- Not yet
Source
Trapped-ion two-qubit gates with >99.99% fidelity without ground-state cooling, arXiv. Preprint. DOI: 10.48550/arXiv.2510.17286
Comparable results
| Machine | Value | Set-up | Published | Measured by | Grade | Record |
|---|---|---|---|---|---|---|
| Atom Computing Ytterbium atom array | 99.4% | single pair | 21 May 2025 | Maker | B | r-000037 |
History
- 27 October 2026: added
Spotted a mistake? Report an error, quoting r-000031.