D-Wave

Qubit counts as the company reports them. Our rankings use QubitBenchmark's checked results instead.

• Disputed 'Beyond-classical' (quantum supremacy) simulation of quantum spin-glass dynamics on an Advantage2 prototype, which the company estimated would take about a million years on the Frontier supercomputer Source
• Peer-reviewed ~99.9% fidelity entangling gate between dual-rail erasure qubits (~500 ns gate time) Source
• Announced Scalable on-chip cryogenic control of gate-model qubits, with far fewer control lines Source

• The Quantum Index Report 2026, MIT Initiative on the Digital Economy (MIT Sloan), in collaboration with Accenture (2026-10). Transparent, sourced and openly licensed data, but it measures activity (patents, funding, press releases) rather than how well the machines perform.
• IDC MarketScape: Worldwide Quantum Computing 2026 Vendor Assessment (IDC #US54125526), IDC (International Data Corporation); analyst Heather West, PhD (2026-06). Analyst judgement of commercial maturity and strategy, not of measured machine performance, and the full placement chart is behind a paywall. Our view of it comes from vendor-licensed excerpts and press releases.
• Comparative Analysis of Contemporary Quantum Computer Processors: Architectures, Performance, and Perspectives, IEEE Access (authors: M. Vukšić, J. Ćelić, A. Cuculić, University of Rijeka) (2026-03-05). Peer-reviewed, but the paper itself says Table 1 is 'a high-level comparative snapshot rather than a definitive ranking'. Its data is already dated, and some milestone dates should be checked against primary sources.
• CB Insights ESP matrices: Quantum computer makers (neutral atoms, photonics, silicon qubit, superconducting circuits, trapped ions), CB Insights (2026). Based on market and business signals, not machine performance. Vendors can brief CB Insights, and most placements are hidden behind a subscription.