[riskable]

I was under the impression that the benefit of quantum computing was the ability to come to the "correct" answer for certain kinds of computationally complex problems instantaneously without having to actually "compute" them. So for example you'd spend a great deal of time up front engineering a way to present a problem to a quantum computer and when you execute said program it gives you the result that very moment without actually having to perform any traditional "operations".

So for example, let's say you wanted to figure out if some enormous number is prime. If you get your program right you could feed it to a quantum computer and all possible states of prime/non-prime would be measured at once resulting in the answer (state) being available the moment you "observe" it.

From this perspective quantum computing can be nearly infinitely faster than traditional computers while at the same time being mostly useless for every-day tasks such as surfing the web.