Quantum Computing Evergreen explainer · neutral data, no opinion
Best 2-qubit gate fidelity
Current verified value
99.99%
What it measures
How often a two-qubit operation succeeds. The threshold for practical error correction sits around 99.9% (“three nines”).
Glossary →History
By actor
Goal / baseline
now99.99%
goal99.99%
baselineEC threshold ≈ 99.9%
“four nines” — comfortable fault tolerance