What is Google Willow RL Self-Correcting Quantum Error Correction?

Google Willow is a superconducting quantum processor chip whose reinforcement-learning-based self-correcting quantum error correction uses machine-learned decoding strategies to detect and correct qubit errors in real time. The approach groups many noisy physical qubits into a single logical qubit, using RL-trained control policies so that error rates fall as the code distance grows rather than rising with the added complexity.