Question: How can you evaluate the value of a qubit to make use of the information stored on it.

Christian Wirtz answered on 14 Nov 2013:

Hey,

the answer is kind of strange… but all you have to do is look at it (not necessarily with your eyes, but with some electronic readout signal) as it will “collapse” from all the possible states onto a specific one the moment you try to communicate with it. The problem is more that you have to not look at it for long enough so it can actually attain the value it shall give you. That may seem really strange, but in quantum mechanics interacting with something (by looking or any other way) changes what it is. So we have to first avoid all contact with it and then look at it.