New Nature Critique Renews Doubts on Microsoft Quantum Claims

On June 24, 2026, a fresh critique published in Nature by UK physicist Henry Legg challenged Microsoft’s quantum-computing claims, citing coding errors in its analysis software and lack of proof for the Majorana quasi-particle. The criticism targets a February 2025 paper central to Microsoft’s Majorana-based strategy, echoing earlier retractions and a 2025 editorial note questioning evidence. Microsoft rejected the claims, asserting independent review and that the disputed software is already deployed on operating chips, while reiterating its 2029 target for a working quantum system. The development adds pressure on Microsoft’s long-term quantum ambitions amid competition from IBM and Google.