B Grade B
Atom Computing Ytterbium atom array: Two-qubit gate fidelity
99.4% %
As stated in the source: “CZ fidelity 99.40(3)% without post-selection; 99.72(3)% with post-selection”
Uncertainty: 99.37 to 99.43 (Stated as 99.40(3)% (without post-selection)).
Caveats
Measured on one or two atom pairs, not across a full array. The higher 99.72% figure requires post-selection (discarding atom-loss events); the 99.40% figure is without post-selection.
- Set-up
- Circuits with more than 200 CZ gates applied to one or two pairs of atoms. Single-qubit Clifford RB fidelity 99.963(2)%.
- Method
- Two-qubit Clifford randomized benchmarking (plus symmetric subspace RB), depolarizing-model extraction of CZ fidelity
- Compared only with
- results in the group “single pair”
- Measured
- Not stated
- Published
- 21 May 2025
- Measured by
- Atom Computing
- Independent of the maker
- No
- Peer-reviewed
- Yes
- Repeated by others
- Not yet
Source
High-fidelity universal gates in the 171Yb ground state nuclear spin qubit, PRX Quantum 6, 020334 (2025); preprint arXiv:2411.11708. Peer-reviewed paper. DOI: 10.1103/PRXQuantum.6.020334
Comparable results
| Machine | Value | Set-up | Published | Measured by | Grade | Record |
|---|---|---|---|---|---|---|
| IonQ Oxford Ionics two-qubit prototype | 99.9916% | single pair | 20 Oct 2025 | Maker | B | r-000031 |
History
- 27 October 2026: added
Spotted a mistake? Report an error, quoting r-000037.