FAQ on Microsoft's topological qubit thing

A very important statement is in the peer review file that everyone should read:

"The editorial team wishes to point out that the results in this manuscript do not represent evidence for the presence of Majorana zero modes in the reported devices. The work is published for introducing a device architecture that might enable fusion experiments using future Majorana zero modes."

https://static-content.springer.com/esm/art%3A10.1038%2Fs415...

Another recent writeup that adds some nuance to this (and other claims), summarizing the quantum-skeptic positions:

https://gilkalai.wordpress.com/2025/02/17/robert-alicki-mich...

I think that Kalai here is very seriously understating how fringe/contrarian his views are. He's not merely stating that there's too much optimism about potential future results, or that there's some kind of intractable theoretical or practical bottleneck that we'll soon reach and won't be able to overcome. He's saying that any kind of quantum advantage—a thing that numerous experiments, from different labs in academia and industry, using a wide variety of approaches, have demonstrated over the past decade—is impossible, and therefore all of those experimental results were wrong and need to be retracted. His position was scientifically respectable back when the possibility he was denying hadn't actually happened yet, but I don't think it is anymore.