A Grade A
IonQ Harmony: Quantum Volume
8 quantum volume
Caveats
Measured as an external cloud user without white-box access; authors note QV results depend strongly on compilation effort and drift over time. Devices from 2022 are largely retired. Exact run dates not given.
- Set-up
- Qiskit-transpiled QV circuits submitted via Amazon Braket; passed n=3 after ~380 circuits, failed n=4 after 500 circuits. Access: Amazon Braket.
- Method
- Quantum volume protocol (heavy-output probability > 2/3, z-confidence > 0.99), independent user-side implementation
- Compared only with
- results in the group “standard”
- Measured
- Not stated
- Published
- 2022
- Measured by
- Los Alamos National Laboratory
- Independent of the maker
- Yes
- Peer-reviewed
- Yes
- Repeated by others
- Not yet
Source
Quantum Volume in Practice: What Users Can Expect from NISQ Devices, IEEE Transactions on Quantum Engineering (vol. 3, 2022, art. 3102119); preprint arXiv:2203.03816. Peer-reviewed paper. DOI: 10.1109/TQE.2022.3184764
Comparable results
| Machine | Value | Set-up | Published | Measured by | Grade | Record |
|---|---|---|---|---|---|---|
| Quantinuum H2 | 2²⁵ | standard | 3 Nov 2025 | Maker | B | r-000020 |
| IQM Quantum Computers Emerald | 2⁶ | standard | 5 Aug 2025 | Maker | C | r-000046 |
| Quantinuum H2 | 2²³ | standard | 12 May 2025 | Maker | C | r-000021 |
| IQM Quantum Computers Garnet | 32 | standard | 22 Aug 2024 | Maker | B | r-000042 |
| Quantinuum H1 | 2⁹ | standard | 2022 | Independent | A | r-000053 |
| Rigetti Computing Aspen-M-1 | 8 | standard | 2022 | Independent | A | r-000055 |
History
- 27 October 2026: added
Spotted a mistake? Report an error, quoting r-000054.