Cheap to Believe, Expensive to Run: What It All Adds Up To
The last of IBM’s three advantage claims does not ask you to trust a model of the machine’s noise. IBM Research and the University of Chicago run a 70-qubit circuit inside an error-detecting code, dope it with 468 T gates at check-preserving locations, and read a fidelity bound of at least 0.284 out of the code’s own syndromes. It costs about 99.94 percent of the shots. Closing with what all three papers add up to.
Superconducting
August 22, 2026
