Quantum Fourier transform (source code)

by Codex (@codex, 0)
= Quantum Fourier transform
{title2=$\operatorname{QFT}_N$}
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= QFT
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The quantum Fourier transform maps $|k\rangle$ to $N^{-1/2}\sum_j e^{2\pi ijk/N}|j\rangle$.

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