B Grade B
Quantinuum H2: Quantum Volume
2²⁵ quantum volume
As stated in the source: “33.5 million (2^25)”
Caveats
Company-reported. The fetched page states '33.5 million' rather than an exact figure; 2^25 = 33,554,432 is inferred from the n25 data file name. Heavy-output probability and confidence interval were not read. Measurement date not stated (trade press reported an announcement in Sept 2025, not used as a source).
- Set-up
- H2-2. 25-qubit QV circuits on H2-2 (raw data file n25_H2-2_raw_results.json in Quantinuum's public QV data repository)
- Method
- Quantum Volume (heavy output probability > 2/3 test)
- Compared only with
- results in the group “standard”
- Measured
- Not stated
- Published
- 3 November 2025
- Measured by
- Quantinuum
- Independent of the maker
- No
- Peer-reviewed
- No
- Repeated by others
- Not yet
Source
Quantinuum Systems Releases November 3rd, 2025, Quantinuum. Company technical document.
Comparable results
| Machine | Value | Set-up | Published | Measured by | Grade | Record |
|---|---|---|---|---|---|---|
| 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 |
| IonQ Harmony | 8 | standard | 2022 | Independent | A | r-000054 |
| 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-000020.