5,627 physical qubits is the largest quantum system fielded — the most logical qubits any commercial machine claims is 48

D-Wave Systems’s 5,627-qubit leader is an annealer, not a gate-model machine. Fidelity, not qubit count, is the binding constraint.

Two-qubit gate fidelity on a nines scale, for the 32 of 40 tracked processors that disclose it — best system per manufacturer, top 6 of 16 shown. Status is printed beside each lane: research-stage figures are stated targets, not fielded results. Four nines (99.99%) is the commonly cited threshold for practical fault tolerance; the leaders are stuck at three.

Superconducting still supplies nearly half the tracked processors, but the highest-fidelity machines on the board are a neutral-atom array and a trapped-ion system.