C Grade C
Quantinuum H2: Quantum Volume
2²³ quantum volume
As stated in the source: “2^23 = 8,388,608”
Caveats
Company blog post. The post names 'System Model H2' only; the H2-1 unit comes from the data file name. Heavy-output probability and confidence interval not read. Superseded by the 2^25 result on H2-2. Quantinuum publishes the raw data for its quantum volume tests.
Not used for rankings. Grade C: announcement-level evidence is shown with a warning and never ranked.
- Set-up
- H2-1. 23-qubit QV circuits (raw data file n23_H2-1_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
- 12 May 2025
- Measured by
- Quantinuum
- Independent of the maker
- No
- Peer-reviewed
- No
- Repeated by others
- Not yet
Source
Quantinuum Dominates the Quantum Landscape: New World-Record in Quantum Volume, Quantinuum. Company technical document.
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 |
| 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-000021.