Quantum Computing, Mathematics, Fourier Transform, Quantum Algorithms.
(7) Well, you see that if θₙ is 0, there shouldn’t be any trouble — we just measure in the X basis again and get the answer for the next bit. But if θₙ is 1, the phase needs to be reduced to a simpler version through which we can extract the next bit. If you think about it, doesn’t this sound like