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Microsoft's Majorana 2 Quantum Chip Aims for Million-Qubit System by 2029

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Microsoft's Majorana 2 Quantum Chip Aims for Million-Qubit System by 2029

dailyguardian.ca

Microsoft unveiled its Majorana 2 topological quantum chip at its Build conference, presenting it as a step toward a scalable million-qubit system and a commercially useful quantum machine by 2029. The company said it improves qubit stability by changing the materials stack, including replacing aluminum with lead as a superconductor and updating semiconductor layers, and reported a mean parity lifetime of about 20 seconds (with some results up to roughly a minute). Microsoft also credited work on refining topological qubits with AI-driven design to better tackle barriers in size, speed, and reliability. Outside experts remained skeptical, saying the evidence does not yet demonstrate true error-resistance for topological approaches and noting the broader field’s history of controversy and retractions. They also pointed out that key results are still in preprint form, arguing earlier claims have not been persuasive enough. Overall, Majorana 2 underscores efforts to make topological qubits more robust, but the strength of the evidence is likely to remain contested alongside the updated roadmap.

Key Points

Microsoft said Majorana 2 updates not only the superconductor (switching from aluminum to lead) but also the semiconductor “active region,” specifying a combination of indium arsenide and indium arsenide antimonide.

Microsoft provided a more detailed baseline from Majorana 1, saying qubit lifetimes were “between one and 12 milliseconds,” contrasted with Majorana 2 lifetimes “exceed 20 seconds” (including cases over a minute).

Microsoft’s Build presentation materials and reporting differed slightly on the headline number, with one account citing a mean lifetime of about 29 seconds (not just ~20 seconds), while still noting some results lasted up to roughly a minute.

Microsoft also framed the end-state as fitting on a palm-sized chip and said it “cut our timeline in half” while accelerating the roadmap—aiming for a scalable, practical quantum computer by 2029.