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Microsoft’s Majorana 2 Claims a 1,000× Leap in Qubit Stability — and Pulls Its Quantum Roadmap Forward to 2029
At Build 2026, Microsoft unveiled Majorana 2, the follow-up to its topological quantum chip, claiming qubits roughly 1,000 times more reliable than the prior generation. A new materials stack — swapping aluminum for lead — pushes the “parity lifetime” of a topological qubit to about 20 seconds, with some lasting a full minute, up from milliseconds. Microsoft says the progress lets it halve its roadmap and target a practical, fault-tolerant quantum computer by 2029 — even as critics remain skeptical of the topological approach.
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