B Grade B
IonQ Forte: Two-qubit gate fidelity
99.536% %
As stated in the source: “median two-qubit error rate 46.4 x 10^-4 across 435 pairs (fidelity about 99.54%)”
Caveats
Value is a median error rate as stated; 99.54% fidelity is a conversion, not quoted. Earlier 30-qubit configuration; current vendor spec says 99.6%. Measurement window (about six months) has no calendar dates. Converted from the stated median error of 46.4×10⁻⁴.
- Set-up
- DRB across all 30 choose 2 = 435 gate pairs, each pair measured at least 4 times over about six months
- Method
- Direct randomized benchmarking (DRB) on all 435 qubit pairs
- Compared only with
- results in the group “median”
- Measured
- Not stated
- Published
- 7 November 2024
- Measured by
- IonQ
- Independent of the maker
- No
- Peer-reviewed
- Yes
- Repeated by others
- Not yet
Source
Benchmarking a trapped-ion quantum computer with 30 qubits, Quantum 8, 1516 (2024) (arXiv:2308.05071). Peer-reviewed paper. DOI: 10.22331/q-2024-11-07-1516
Comparable results
| Machine | Value | Set-up | Published | Measured by | Grade | Record |
|---|---|---|---|---|---|---|
| IQM Quantum Computers Emerald | 99.5% | median | 5 Aug 2025 | Maker | C | r-000047 |
| Rigetti Computing Ankaa-3 | 99.5% | median | 23 Dec 2024 | Maker | C | r-000040 |
| IQM Quantum Computers Garnet | 99.5% | median | 22 Aug 2024 | Maker | B | r-000044 |
| Rigetti Computing Cepheus-1-108Q | 98.82% | median | – | Maker | B | r-000041 |
History
- 27 October 2026: added
Spotted a mistake? Report an error, quoting r-000030.