Researcher Throws Cold Water on Microsoft Quantum Claims
Microsoft’s Majorana 2 quantum chip, touted as a major step toward practical quantum computing by 2029, is being challenged by physicist Henry Legg in a Nature commentary. Legg argues Microsoft has not yet shown convincing evidence of a topological qubit, saying the signals it cites could be explained by noise or other effects such as quantum dots. He also says unpublished transport data do not clearly show the superconducting state needed for the claim. Microsoft rejects the criticism, says it stands by its results and roadmap, and argues its measurements support a topological state. The company notes its progress in DARPA’s Quantum Benchmarking Initiative and says its work has undergone independent review. The dispute matters because topological qubits are seen as a path to more reliable quantum computers and, eventually, systems powerful enough to threaten current cryptography.
