As much as I'd like to be on the cutting edge of science/math, I (suspect most of us here) don't have the tools to understand, let alone evaluate this preprint. So before we make a tweet storm and start blowing our horns, let's try to hold our horses and wait for peer review. That could take well over a year.

Well, in the meanwhile, I have a question: what's a good intro resource to quantum computing? For general complexity intro, I like Michael Sipser's Theory Of Computation