The human that wrote this is actually a enormous assemblage of nanorobotics albeit of the carbon variety.
That’s one of the more powerful counterarguments against “Drexlerism.” Nanotech already exists. It’s called biology and it has already spent a billion years exploring the combinatorial space of what molecular machinery can do. Indeed it has evolved a lot of very exotic molecular machines that do seem to take advantage of quantum effects in various ways. We are grey goo, and are currently working to build rockets to g…
In fairness, we are green goo and it's not like the universe was doing anything better with it's atoms. (We're also not likely to succeed much within the solar system, and almost certainly not likely to succeed outside of it.)