B Grade B
Atom Computing Ytterbium atom array: Logical qubits
24 logical qubits
As stated in the source: “24 logical qubits in a cat state, encoded into 48 atoms with the [[4,2,2]] code”
Caveats
Distance-2 code: detects errors (discarding those shots) and corrects only atom loss. The encoded cat state still has a combined X+Z error of 26.6%, so these are not low-error logical qubits. Not peer-reviewed (no journal reference on arXiv).
- Set-up
- 256-qubit processor, with Microsoft. [[4,2,2]] error-detecting code (distance 2), 12 code blocks; encoded circuit used 59 atoms and 101 physical CZ gates; error detection plus correction of lost atoms (on average 1.8). Total X+Z error pX + pZ = 26.6% encoded vs 42.0% unencoded baseline. Same paper: Bernstein-Vazirani on up to 28 logical qubits in 112 atoms ([[4,1,2]] code).
- Method
- Standard
- Compared only with
- results in the group “error detecting”
- Measured
- Not stated
- Published
- 18 November 2024
- Measured by
- Microsoft Quantum and Atom Computing
- Independent of the maker
- No
- Peer-reviewed
- No
- Repeated by others
- Not yet
Source
Fault-tolerant quantum computation with a neutral atom processor, arXiv (preprint, v3 9 Jun 2025). Preprint. DOI: 10.48550/arXiv.2411.11822
Comparable results
| Machine | Value | Set-up | Published | Measured by | Grade | Record |
|---|---|---|---|---|---|---|
| Infleqtion Cesium atom array | 12 | error detecting | 16 Sep 2025 | Maker | B | r-000039 |
| QuEra Computing Harvard–MIT rubidium atom array | 48 | error detecting | 6 Dec 2023 | Maker | B | r-000033 |
History
- 27 October 2026: added
Spotted a mistake? Report an error, quoting r-000035.