14:37Google Just Made a Massive Quantum Breakthrough
A dense fifteen minute walkthrough of one Nature paper from Google Quantum AI and Google DeepMind, Reinforcement learning control of quantum error correction. The premise: a quantum computer's real problem is not that qubits are fragile, it is that the machine is analog and its thousands of microwave control parameters drift out of tune while you use them, and the only fix so far has been to kill the computation and recalibrate. Google gave the error correction system's own detection events a second job, feeding them to a reinforcement learning agent that retunes the controls while the computation keeps running. On a Willow processor it found another 20% suppression of the logical error rate on top of full expert calibration, delivered a 3.5 fold improvement in stability against injected drift, and set record logical error rates of 7.72 x 10^-4 per cycle for the distance 7 surface code and 8.19 x 10^-3 for the distance 5 color code. Simulations to distance 15 and 40,000 parameters show the training cost is independent of system size.









