I'm aware that a qubit can exist in an infinite number of states and that when measured it collapses into one state, with the probability of each state being directly affected by it's latitude.
My question is: Why is this in any way useful? Surely you can't use a unit of information meaningfully when you don't know what it will be..?
Surely, not knowing what a quantum bit is going to be is detrimental to computing? I'm evidently missing something since we know that quantum computing works, but why?