Earlier quoted context omitted.
But those cannot exist, can they? Nature seems really opposed to the realisation of ideals.
My company is making them. You just need to have a sufficiently resilient surface code, which means a single device with millions of physical qubits (the standard brute-force approach) or use a qubit architecture that is intrinsically noise-free by comparison, and only needs 15-50 physical qubits (what my company is doing, and our competitors). The industry as a whole is probably only a few years away from achieving…
Why is it that every time I read about quantum computers, fusion, and high energy density batteries, the word "just" seems extremely load-bearing, but results are like just, nowhere to be seen