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 | |
|---|---|---|---|---|
|
IBM | superconducting | public IBM | The largest superconducting program: processors on the cloud since 2016, an open software stack (Qiskit), and a public roadmap toward error-corrected systems. |
|
Rigetti Computing | superconducting | public RGTI | A public pure-play building superconducting chips and full systems, with its own fabrication facility and cloud access. |
|
IonQ | trapped-ion | public IONQ | The first pure-play quantum company to list publicly; trapped-ion systems available through all major clouds. |
|
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. |
|
Intel | silicon-spin | public INTC | Betting that qubits should be built like transistors: silicon spin qubits made on standard 300mm wafers. |
|
D-Wave | annealing | public QBTS | The annealing pioneer. Commercial machines for years, thousands of qubits, and an honest asterisk: annealing is purpose-built for optimization, not universal gate-model computing. |
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.