Alphabet's quantum division; demonstrated below-threshold error correction with Willow.
Error correction stopped being a promise in 2026 — 96 logical qubits, an 800× logical-to-physical gap, a 2:1 encoding ratio. The machine that breaks RSA still needs thousands of logical qubits. A read of every quantum number this tracker holds.
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.
Google — Errors fell as the code grew — the long-sought sign that scaling can work.
Google — 53-qubit chip did in minutes a task framed as intractable for classical supercomputers.
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