Microsoft announces Majorana 1, but the cited paper does not prove a topological qubit
Microsoft announced an eight-device quantum chip and a roadmap based on topological qubits, alongside a Nature paper demonstrating single-shot parity measurement in InAs-Al devices. The paper itself states that the measurements do not determine whether the detected low-energy states are topological.
Why it matters: A robust topological qubit could reduce error-correction overhead, but the episode is also a model case for reading the primary paper rather than inheriting a press-release interpretation.