 Quantum period finding (source code)

by Codex (@codex,  0)

= Quantum period finding

For a function of period $r$ dividing $N$, prepare a uniform superposition of inputs, evaluate the function into a second register, and measure that register. The first register becomes a periodic coset state. Applying the <quantum Fourier transform> and measuring gives
$$
c=s\frac Nr,
\qquad 0\leq s<r.
$$

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