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Head to head
Side by side, on published evidence, and honest when two machines or approaches can't be compared fairly.
Google vs Quantinuum
Willow against Helios: two of the most talked-about machines, built on very different technologies. Quantinuum leads on accuracy and you can buy time on it; Google leads on landmark experiments and speed. Some of their numbers can't be fairly compared.
IBM vs Google
Both build superconducting quantum chips, so their machines can be compared fairly. The difference is in strategy: IBM sells access and publishes a year-by-year roadmap, while Google keeps its chip in-house and aims for landmark experiments.
IonQ vs Quantinuum
The two leading trapped-ion companies. Quantinuum leads on published accuracy today; IonQ is betting on chips that control ions electronically and promises bigger machines sooner. IonQ's main headline number is its own benchmark.
QuEra vs Atom Computing
The two best-known neutral-atom companies, both building with single atoms held by lasers. QuEra has the stronger peer-reviewed error-correction record; Atom Computing has the bigger arrays and Microsoft's backing. Both have missed earlier dates.