Why people believe this
D-Wave sells quantum computers with thousands of qubits. Gate-based quantum computers have far fewer. D-Wave must be more powerful since it has more qubits.
The correction
D-Wave quantum annealers and gate-based quantum computers (IBM, Google, IonQ) are fundamentally different architectures solving different problems. Annealers are analog devices that physically implement optimization by slowly cooling a quantum system to its ground state — they can only solve certain optimization problems in this specific way. Gate-based computers are universal — they can run any quantum algorithm including Shor's and Grover's. D-Wave qubits have very short coherence times, very low connectivity, and cannot run general quantum circuits. The qubit counts are not comparable.
Simulator note
Quantum annealing requires analog continuous-time simulation — not representable as a discrete gate circuit. The distinction is architectural and conceptual rather than demonstrable in a gate simulator.
Research notes
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