Microsoft Quantum Computing Claim Still Lacks Evidence

Nature: A Microsoft researcher [this week] presented results behind the company's controversial claim last month to have created the first 'topological' qubits -- a long-sought goal of quantum computing. In front of a packed room at a meeting of the American Physical Society (APS), Chetan Nayak, a theoretical physicist leading Microsoft's quantum computing effort in Redmond, Washington, explained how the company is developing topological qubits, which would be the building blocks for a noise-resistant quantum computer. Physicists in the audience told Nature's news team they are still unsure whether Microsoft really has made the first topological qubits, however. "It's a hard problem," says Ali Yazdani, an experimental physicist at Princeton University in New Jersey. To anyone trying to make topological qubits, he says, "good luck." When Nayak displayed measurement data during his presentation, he acknowledged that a characteristic signal was difficult to see due to electrical noise, prompting Cornell University theorist Eun-Ah Kim to question its robustness. Microsoft says additional details will be available in a forthcoming paper on the arXiv preprint server. Further reading:Scientists Question Microsoft's Quantum Computing Claims;Microsoft Quantum Computing 'Breakthrough' Faces Fresh Challenge

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