Error-corrected qubits that actually do useful work. The number that matters — and the one most often confused with physical qubits.
For decades, adding qubits added errors faster than you could correct them. “Below threshold” is the turning point where making the code bigger makes it more reliable — the precondition for a useful machine.
A 6,100-qubit array and 96 logical qubits sound contradictory until you know the difference. Physical qubits are the raw, noisy hardware; logical qubits are many physical ones error-corrected into one reliable unit. The second number is the one that matters.
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Google Quantum AI