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user 290499
Applies to questions of primarily educational value - not only questions that arise from actual homework assignments, but any question where it is preferable to guide the asker to the answer rather than giving it away outright. Please READ THE GUIDANCE IN META before asking homework-like questions.
0
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Derivation of QFT product formula
If the quantum fourier transform is defined as follows:
$$
U_{FT} |x\rangle = \frac{1}{2^{n/2}} \sum^{2^n-1}_{y=0} e^{2\pi i x y / 2^n} | y \rangle.
$$
We can rewrite the exponential term as:
$$
e^{2\ …
- 267
11
votes
2
answers
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Why is the trace of the outer product of two states equal to the inner product of the two st...
Why is it that, given two quantum states $|\psi_1\rangle$, $|\psi_2\rangle$,
$$\mathrm{Tr}(|\psi_1\rangle\langle\psi_2|) = \langle\psi_2|\psi_1\rangle \quad $$
I went through the equation with the qub …
- 267