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Breaking news
Big developments as they happen, labelled by how far the evidence has got. News never moves a rank on its own.
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MIT's Quantum Index Report 2026 compares about 300 quantum processors
MIT's annual report charts the state of quantum computing, including a comparison of around 300 processors. Its benchmarking numbers are mostly reported by the companies themselves, which the report says openly.
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Quantinuum reports a tenfold improvement in error-corrected accuracy on Helios
Quantinuum says its Helios computer ran error-corrected operations with about 5 errors per million, ten times better than its own previous record. It's a company announcement, not yet checked by others.
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DARPA moves IBM, IonQ, Atom Computing and Diraq into the final stage of its quantum test
Six teams are now in the last stage of the US government's Quantum Benchmarking Initiative, which checks whether a company's plan for a useful quantum computer could really work.
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Independent study finds Quantinuum ahead of IBM on error-correction building blocks
Researchers at Germany's Jülich Supercomputing Centre tested the basic operations error correction needs on 10 machines from Quantinuum, IBM and IQM. Quantinuum's machines had the lowest error rates. The study isn't peer-reviewed yet.
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One of IBM's "quantum advantage" experiments is reproduced on ordinary computers
IBM and partners posted three papers in July claiming quantum advantage. A new preprint reproduces one of them, a 70-qubit experiment, on conventional graphics processors in about 37 minutes.