A new paper argues Microsoft exaggerated its quantum claims a year ago

A critique published in Nature on March 12, 2024, challenges the fundamental technology underpinning Microsoft's "breakthrough" quantum computing chip, the Majorana 1. Microsoft had announced this chip in February 2025, asserting it utilized a novel topological qubit technology intended as the "building blocks" for their future quantum computer. The paper, authored by researchers from the University of Waterloo and the University of Sherbrooke, argues that the experimental evidence presented by Microsoft does not conclusively demonstrate the existence of the Majorana zero modes, which are essential for topological qubits. Specifically, the authors point to the absence of clear signatures of these modes in the device's electrical measurements. They contend that the observed signals could be explained by conventional, non-topological phenomena, such as the presence of stray magnetic fields or other experimental artifacts. The critique suggests that Microsoft's claims of achieving a functional topological qubit were premature and that further rigorous experimental validation is required. This scientific scrutiny raises questions about the reliability of Microsoft's past pronouncements in the highly competitive field of quantum computing, where significant investment and progress are eagerly anticipated.