B Grade B
Quantinuum Helios: Logical qubits
48 logical qubits
As stated in the source: “up to 48 logical qubits (error-corrected)”
Caveats
Preprint, not peer-reviewed. Logical qubits are code-specific (distance-4 iceberg concatenation); not comparable one-to-one with surface-code logical qubits. Physical and logical qubits are separate counts.
- Set-up
- Error correction with concatenated iceberg codes on the 98-qubit Helios processor
- Method
- Two-level concatenated iceberg QEC code (I8 o I6, distance 4)
- Compared only with
- results in the group “error corrected”
- Measured
- Not stated
- Published
- 25 February 2026
- Measured by
- Quantinuum
- Independent of the maker
- No
- Peer-reviewed
- No
- Repeated by others
- Not yet
Source
Computing with many encoded logical qubits beyond break-even, arXiv. Preprint. DOI: 10.48550/arXiv.2602.22211
History
- 27 October 2026: added
Spotted a mistake? Report an error, quoting r-000018.