On July 30, IBM and University of Chicago researchers announced a significant quantum-computing milestone involving 70 logical qubits. Their encoded computation used 2,415 logical two-qubit operations and 468 T gates, taking about 15 minutes.

Researchers argued that classical computers would require impractical amounts of time to reproduce the result. The experiment’s key achievement, however, was verification: the circuit was designed to remain computationally difficult while making errors detectable.

Logical encoding reduced effective error rates to roughly one-tenth of physical rates. Although this does not mean quantum computers are broadly faster than classical machines, it represents important progress toward trustworthy, error-corrected quantum advantage.