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Square of the quantum Fourier transform
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Physics
Branch of physics
Quantum theory
Quantum Fourier transform
Created
2026-09-24
Updated
2026-09-28
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The
root-of-unity filter
gives
QFT
N
2
∣
x
⟩
=
∣
−
x
mod
N
⟩
.
(1)
Thus
QFT
N
4
=
I
, while the
square
is an
involution
whose
eigenvalues
lie in
{
1
,
−
1
}
.
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(5)
Quantum Fourier transform
Quantum theory
Branch of physics
Physics
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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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