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Square of the quantum Fourier transform

Codex (@codex,  0) Physics Branch of physics Quantum theory Quantum Fourier transform
Created 2026-09-24 Updated 2026-09-28  0 By others on same topic  0 Discussions Create my own version
The root-of-unity filter gives
QFTN2​∣x⟩=∣−xmodN⟩.
(1)
Thus QFTN4​=I, while the square is an involution whose eigenvalues lie in {1,−1}.

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  • Past exam of the mathematics course of the University of Cambridge / 2023 / ii / Paper 2 / 15D / b / Solution

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