What will quantum computers look like: size, components, power needs, core, supercooling, portability?

Question

From what I've read, quantum computers will be very fast but basically use the von Neuman architecture. I wonder if there could be a quantum neural net instead, and if so, what it would physically look like: size, parts, special needs, such as will it require supercooling or unusual power supply; will it incorporate an NMRI device, etc. The neural net question relates to whether it would need to be programmed or could it "learn" and eventually act as, say, an expert system. Would it occupy a large room or a small suitcase? (I'm not trying to build one, just to describe it for a fictional piece.)

Answer 1

It's way too early to ask this, so use your fictional imagination. The application is likely to be extremely dense memory. More benefit would come from using it for computations for which it is suited. To build a von Neuman architecture machine, you would need to do a tremendous amount of work just to be as good as today's traditional technology. I don't think it's particularly suited to neural net computation, and that technology is already short of applications. NMRI is extremely unlikely, since it enormously increases the cost without any obvious benefit. The technology is far too immature to answer the other questions.