Signal Microsoft's New Majorana 2 Quantum Chip Claims Dramatic Breakthrough in Qubit Stability

Summary

Microsoft announced its Majorana 2 quantum chip on 2 June 2026, claiming qubit stability 1,000 times better than its predecessor, Majorana 1. Qubit lifetimes rose from 5-10 seconds per qubit in Majorana 1 to at least 20 seconds, with some qubits lasting as long as a minute. The improvement came from replacing aluminum superconductors with lead superconductors for better shielding against external disturbances, within a topological qubit design using an indium arsenide semiconductor and superconductor material stack. Microsoft Discovery, the company's agentic AI research platform, assisted in chip design by automating measurements and optimizing fabrication. Microsoft Technical Fellow Chetan Nayak said, "We're 1,000 times better" than the previous year, and the company now targets building a scalable quantum computer by 2029, cutting its previous timeline in half. Analyst Holger Mueller of Constellation Research called it "a massive step forward," noting that a 20-second qubit lifetime is "basically unheard of."