Researchers cast new doubt on Microsoft’s quantum computing advance

The text summarizes Microsoft’s work on Majorana-based quantum devices: an initially retracted 2018 claim, a 2025 Nature paper describing a 'Majorana 1' transistor, and the recent launch of 'Majorana 2,' which Microsoft says uses AI to achieve a 1,000-fold reliability improvement and moves a scalable quantum computer target to 2029.