Timeline milestone
Google’s Willow crosses an error-correction threshold
From The Road to Useful Quantum Computing: From Qubits to Error Correction
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Breakthrough
Google’s Willow crosses an error-correction threshold
Google reported that increasing the size of its surface code reduced the logical error rate, a key requirement for scalable fault tolerance.
Below-threshold error correction means adding properly controlled physical qubits can improve a logical qubit rather than make it worse. The result was a major engineering step, but one improved logical memory is still far from the many reliable logical qubits and operations needed for broad applications.
