Company directory
Who is building what, across all seven hardware modalities and the software layer. Names and modality assignments are verified; quantitative claims stay out until checked against primary sources.
| Company | Modality | Status | Approach | |
|---|---|---|---|---|
|
Google Quantum AI | superconducting | subsidiary GOOGL (Alphabet) | Alphabet's superconducting effort. The 2019 supremacy-benchmark claim and prominent below-threshold error-correction demonstrations. |
|
AWS (Amazon) | superconducting | subsidiary AMZN (Amazon) | Amazon's hardware effort focuses on error-corrected cat-qubit architectures, alongside the Braket cloud service offering other vendors' machines. |
| Q | Quantinuum | trapped-ion | subsidiary majority-owned by Honeywell (HON) | Formed from Honeywell Quantum Solutions and Cambridge Quantum; trapped-ion hardware plus a large software arm, with prominent logical-qubit results. |
Directory facts policy: this field's numbers change quarterly, and wrong numbers destroy credibility. Founding years, headquarters, funding and device specs render as "to verify" until checked against primary sources. Never a recommendation of any company.