The Chicago result deserves careful applause. IBM and the University of Chicago

did not simply run a circuit no classical machine could match — they built one

that reports its own errors. That is the harder problem.

For years, quantum advantage claims have rested on trust: the machine says it is

right, and checking is infeasible. Encoding 70 logical qubits and cutting e!ective

error rates roughly tenfold moves the argument from speed to evidence.

“We are now firmly in the quantum advantage era.”

JAY GAMBETTA, DIRECTOR OF IBM RESEARCH

No one should read this as quantum computers beating classical ones at usef

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