Microsoft's ambitious claims of a significant breakthrough in quantum computing have been challenged by a new peer-reviewed analysis published in the prestigious scientific journal, Nature. Dr Henry Legg, a lecturer at the University of St Andrews, argues that the tech giant's 2025 announcement regarding the detection and control of Majorana particles, crucial for its topological quantum computing approach, may be fundamentally flawed due to coding errors and incomplete data presentation.
Microsoft initially declared its quantum leap in February 2025, predicting that its work with Majorana particles would enable the creation of a meaningful quantum computer in years, not decades. This approach, which involves elusive subatomic particles yet to be directly observed, has been a long-term focus for the company, despite previous setbacks and retractions of some research papers. Last year, Microsoft claimed success in both observing these particles and harnessing them within a quantum computing framework.
However, Dr Legg's critique, titled 'On the robustness of topological gap detection via transport', suggests otherwise. He asserts that Microsoft's 'tune-up software', designed to detect the phase transition necessary for quantum calculations using Majorana particles, contained 'basic Python programming errors'. Furthermore, Legg's analysis, based on underlying transport data that was not included in Microsoft's original publication, indicates that the company's devices may contain significant disorder, making them incompatible with the existence of a 'topological gap' – a prerequisite for their quantum claims.
Legg's research specifically highlights that Microsoft's plotting code for its Topological Gap Protocol (TGP) was set to 'highlight only the largest purportedly topological region'. He claims that this led to the omission of other regions that also passed their tune-up protocol. When questioned by peer reviewers, Microsoft allegedly stated that they had investigated the only region passing the protocol within the explored range, a statement Legg contends was 'not correct'. He further notes that coding errors involved 'antisymmetrizing bias voltage based on array index rather than physical value', a fundamental programming mistake.
In response to the impending publication of Legg's critique, for which it was given a right to reply, Microsoft announced 'Majorana 2' in early June 2026 – a 'next-generation topological quantum chip' developed with the aid of its own agentic AI. The company continues to insist that its initial work is sound, despite the growing scientific scrutiny. Dr Legg, however, remains unconvinced, telling The Register that based on his analysis, Microsoft is 'centuries, not decades away' from a topological quantum supercomputer, and that the most likely scenario is that 'it doesn't work at all'.
This dispute places Microsoft's quantum computing ambitions under a significant spotlight, raising questions about the rigour of its research and the transparency of its data presentation within the scientific community. The implications extend beyond Microsoft, potentially affecting the broader perception and direction of topological quantum computing research.