Overview
- Microsoft, which unveiled Majorana 2 on Tuesday, June 2, 2026, posted a technical preprint on arXiv reporting parity lifetimes near 20 seconds and some exceeding one minute as a proxy for qubit stability.
- The team says Majorana 2 swaps aluminum for a lead-based superconductor and updates the semiconductor stack while using Microsoft Discovery’s agentic AI to speed materials discovery and automate experiments.
- Microsoft has set a new goal of demonstrating a scalable, practical quantum computer by 2029 and increased the device’s qubit count from 8 to 12 in the Majorana 2 design.
- Many independent physicists and journals remain skeptical because the preprint is not peer reviewed, the paper reports only one type of measurement (Z parity) and lacks the full X-measurements and public data needed for replication.
- The company cites trade secrets and says it has shared confidential results with agencies such as DARPA, but researchers warn that verification, broader device testing, and peer review are needed before the claims change industry timelines or raise cryptography risks.