Microsoft has unveiled Majorana 2, its second topological quantum chip, claiming qubits that are a thousand times more reliable than those in its predecessor.
Majorana 2 follows the company's Majorana 1 announcement from last year, which Microsoft billed as a breakthrough in quantum computing. Physicists pushed back almost immediately, questioning whether the underlying science supported the claims. The new chip uses a revised material stack and, according to Microsoft, benefited from its Discovery AI platform during development. Microsoft says the reliability jump moves the industry closer to quantum computers that can do something genuinely useful, rather than just demonstrate that qubits can exist.
Why this matters is less about Majorana 2 specifically and more about the approach. Microsoft is pursuing topological qubits, a design that theoretically encodes information in the physical structure of matter rather than fragile quantum states, making errors less likely. That puts Microsoft on a very different path from Google and IBM, both of which have committed to superconducting architectures and have already hit their own milestones with peer-reviewed results.
One press release does not settle a scientific dispute. The physics community's skepticism about Majorana 1 was rooted in methodology, not Microsoft-bashing, and Majorana 2 will need independent scrutiny before the timeline claims mean much.