Well, within the quantum realm it is impossible to both measure the speed and location of a subatomic particle - called Heisenberg's uncertainty principle. This is why the location of even a single electron is always displayed as a cloud around an atom.Lol its not. Its just too chaotic to predict. But its deterministic too. Otherwise how quantum pcs are working and giving same results.
It was observed that firing a single electron produced wave pattern which means it has travelled all possible routes - once you try to observe it however, it will appear in one seemingly random location.
Not sure how quantum computing works*, but some aspects of particles like spin are constant.
* Obvisouly I don't claim to know how quantum mechanics work either, simply at one point I read books by Hawking, Davies and Penrose that can be digested by mere mortals.
The bottom line is that there is a veiled aspect of the world we live in, which remains random from our perspective.