Overview
- Microsoft unveiled Majorana 2 at its Build developer conference on June 2–3, 2026, and published a paper reporting a median parity lifetime near 20 seconds with some runs up to about 60 seconds, which the company says makes its qubits roughly 1,000 times more reliable than its prior device.
- The company says the key technical change is a new materials stack that replaces aluminium with lead and uses indium arsenide and indium arsenide‑antimonide in a tetron architecture, which Microsoft claims doubles the topological gap that would protect Majorana qubits from local noise.
- Microsoft credits its Microsoft Discovery AI tools for speeding experiments by automating measurements, managing workflows and optimizing fabrication settings across hundreds of tuning parameters that would otherwise take weeks to explore manually.
- DARPA has selected Microsoft for the final phase of its quantum benchmarking program, which the company presents as external validation, but the published manuscript was not peer reviewed and experts say independent replication is required to rule out conventional explanations for the signals.
- The announcement moves Microsoft’s internal roadmap toward a scalable device around 2029, but the field’s fraught history including a 2018 Nature paper retraction and strong community skepticism mean confirmation will depend on external tests and published peer review.