B Grade B
IQM Quantum Computers Garnet: Two-qubit gate fidelity
99.5% %
As stated in the source: “median 2-qubit gate fidelity of 99.5% (median CZ error 5 x 10^-3)”
Caveats
Measured with spatially separated pairs to limit crosstalk; fully parallel (distance-one) operation gives lower fidelity. Company-run, not peer-reviewed.
- Set-up
- Median across qubit pairs; gates characterized in parallel with pairs separated by two idling couplers and one idling qubit. Benchmarking in distance-one groups lowers mean CZ fidelity by 0.6 (as stated). Median single-qubit gate error 9 x 10^-4.
- Method
- Interleaved randomized benchmarking of CZ gates, run in parallel in distance-two groups
- Compared only with
- results in the group “median”
- Measured
- Not stated
- Published
- 22 August 2024
- Measured by
- IQM Quantum Computers
- Independent of the maker
- No
- Peer-reviewed
- No
- Repeated by others
- Not yet
Source
Technology and Performance Benchmarks of IQM's 20-Qubit Quantum Computer, arXiv (preprint; also issued as IQM white paper). Preprint. DOI: 10.48550/arXiv.2408.12433
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 |
| IonQ Forte | 99.536% | median | 7 Nov 2024 | Maker | B | r-000030 |
| 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-000044.