Computing · 2024
Willow (below-threshold QEC)
Adding qubits reduces errors, for the first time.
Google's 105-qubit Willow chip showed logical error rates halving each time the surface code grew from distance 3 to 5 to 7. Operating below threshold is the key requirement for scalable fault-tolerant quantum computing.
What it built on 2
What it led to 2
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Related measurements
The dashed line marks when it first worked.
Selected gate-model quantum processors Latest: 1.12k physical qubits (2023) Source: Wikipedia: Timeline of quantum computing and communication; Wikipedia: List of quantum processors