Quantum phase estimation and the quantum Fourier transform | QuTech Academy

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Video: Quantum phase estimation and the quantum Fourier transform

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how does it come out that the probability amplitude of the + state with coefficient 1/2 + e^(i*fi)/2 will be 1/2+cos(fi)/2? Or did you mean that the probability of 0 measurement output will be this much? But then it is a mistake to say that we measure in the X base.

istvandentora
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One thing that i don't understand. When you do a controlled-U gate, why is the phase kicked back to the control qubit and not to the target qubit?

itanbar