
Microsoft's Majorana 2 chip has qubits that last 20 seconds — and a scalable quantum computer by 2029
Unveiled at Build 2026, Majorana 2 is Microsoft's second topological quantum chip. Its qubits have a mean lifetime of 20 seconds — roughly 1,000 times longer than its predecessor — achieved through a new materials stack developed with the help of an agentic AI system. Microsoft has cut its timeline to scalable quantum from 2033 to 2029.










