I have a very basic question: say I perform some set of operations on $N$ qubits (like QFT, QFT addition etc), and thus have a $N$ qubit final state.
If each qubit has something that I want to read off of it, is it possible to extract data from each qubit into classical?
I now know how to load classical data onto a quantum device, but how do I read the final data? Is it impossible to get it since the wavefunction collapses? What I mean to ask is whether there exists a general protocol to read final N qubits into N classical bits (even at least by repeated measurements (bounded by the Chernoff limit) or similar such methods).