B Grade B
QuEra Computing Harvard–MIT rubidium atom array: Logical qubits
48 logical qubits
As stated in the source: “up to 48 logical qubits in [[8,3,2]] code blocks (128 physical qubits for this circuit)”
Caveats
The [[8,3,2]] code is distance 2: it detects errors but cannot correct them, and results rely on post-selection. No per-logical-qubit error rate is given for the 48-qubit circuit; performance is reported as an XEB score (about 0.1). Research system, not a commercial product.
- Set-up
- 3D [[8,3,2]] error-detecting code (distance 2), 16 blocks of 3 logical qubits; IQP sampling circuit with 228 logical two-qubit gates and 48 logical CCZ gates; results with error detection (post-selection). XEB of about 0.1 reported for the 48-logical-qubit circuit.
- Method
- Standard
- Compared only with
- results in the group “error detecting”
- Measured
- Not stated
- Published
- 6 December 2023
- Measured by
- Harvard University, MIT, QuEra Computing and NIST/University of Maryland (Lukin group collaboration)
- Independent of the maker
- No
- Peer-reviewed
- Yes
- Repeated by others
- Not yet
Source
Logical quantum processor based on reconfigurable atom arrays, Nature 626, 58-65 (2024); preprint arXiv:2312.03982. Peer-reviewed paper. DOI: 10.1038/s41586-023-06927-3
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 |
| Atom Computing Ytterbium atom array | 24 | error detecting | 18 Nov 2024 | Maker | B | r-000035 |
History
- 27 October 2026: added
Spotted a mistake? Report an error, quoting r-000033.