B Grade B
Infleqtion Cesium atom array: Two-qubit gate fidelity
99.35% %
As stated in the source: “CZ fidelity 99.35(4)%; 99.73(3)% when excluding atom-loss events”
Uncertainty: 99.31 to 99.39 (Stated as 99.35(4)%).
Caveats
Fidelity partly relies on a model-based leakage estimate rather than full randomized benchmarking. The 99.73% figure excludes atom-loss events. The paper does not name the system as a commercial product.
- Set-up
- 24-qubit computational array. Nearest-neighbour CZ gates via individual optical addressing (no atom shuttling). Local single-qubit RZ fidelity 99.902(8)%.
- Method
- Repeated-CZ benchmarking of two-atom survival and cycle polarization, combined with a model-based leakage estimate
- Compared only with
- results in the group “statistic not stated”
- Measured
- Not stated
- Published
- 25 August 2025
- Measured by
- Infleqtion (with University of Wisconsin-Madison co-author)
- Independent of the maker
- No
- Peer-reviewed
- Yes
- Repeated by others
- Not yet
Source
A universal neutral-atom quantum computer with individual optical addressing and non-destructive readout, PRX Quantum 6, 030334 (2025); preprint arXiv:2408.08288. Peer-reviewed paper. DOI: 10.1103/66s8-jj18
Comparable results
| Machine | Value | Set-up | Published | Measured by | Grade | Record |
|---|---|---|---|---|---|---|
| IonQ Tempo | 99.9% | statistic not stated | – | Maker | C | r-000027 |
History
- 27 October 2026: added
Spotted a mistake? Report an error, quoting r-000038.