Microsoft's announcement of a breakthrough in quantum computing faces skepticism from physicists, who say evidence supporting the company's claims remains insufficient.

The tech giant reported creating Majorana particles - a development it says could revolutionize quantum computing - but the accompanying peer-reviewed paper in Nature does not conclusively demonstrate this achievement, according to multiple quantum physics experts who reviewed the research.

Microsoft's corporate vice president for quantum hardware, Chetan Nayak, acknowledged the Nature paper wasn't meant to prove the particles' existence, though he claimed measurements suggested "95% likelihood" of topological activity. The company plans to publish additional findings.

The announcement has drawn particular scrutiny given the field's history of retracted claims. Two previous Nature papers on similar discoveries were withdrawn in 2017 and 2018, while a 2020 paper in Science involving Microsoft researchers remains under review. "This is where you cross over from the realm of science to advertising," said Jay Sau, a theoretical physicist at the University of Maryland who sometimes consults for Microsoft but wasn't involved in the current research.

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