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 | |
|---|---|---|---|---|
|
Microsoft | topological | public MSFT | The deliberate outlier: topological qubits designed to be error-resistant by physics. Hardest science, biggest payoff if it works; Azure Quantum meanwhile offers other vendors' machines. |
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.