Google Quantum AI has done it again — this time, with a “quantum rewind button.”
In a new Nature paper, researchers report constructive interference at the edge of quantum ergodicity, showing that their 65-qubit processor completed calculations in couple of hours that would take the world’s fastest supercomputer over three years to simulate.
By using a special “echo” measurement called an Out-of-Time-Order Correlator (OTOC), they effectively unscrambled quantum information — and proved that their system operates firmly beyond the classical limit.
This marks a definitive step toward practical quantum advantage, where quantum computers reveal physical truths that no classical algorithm can reach.

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