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Physics
Quantum Physics
Quantum phase estimation - Question regarding rewriting the state
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[QUOTE="Strilanc, post: 6561892, member: 96470"] Ah, it's not a description of a solution it's a description of a problem. When you have a register x that contains a uniform superposition and you measure f(x), where f is a periodic function period p, you are left with a superposition where every p'th state is present... with some uncontrollable offset b. The book is then going to show that when you take the Fourier transform of this register, the offset b becomes purely phase information; the magnitudes of the amplitudes of the superposition don't depend on b. Measuring in the frequency basis avoids the unknown offset problem. [ATTACH=full]291976[/ATTACH] Image is from here: [URL]https://algassert.com/post/1718[/URL] [/QUOTE]
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Quantum Physics
Quantum phase estimation - Question regarding rewriting the state
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