0
$\begingroup$

enter image description here

I know different parts of this circuit, just I have a problem with that part that I circled in picture. I want to know the function of that part. If you have useful information about it, please share it with me. Thank you so much.

$\endgroup$
0
$\begingroup$

It's a modular multiplication gate. It permutes the states such that, for all $k$ below $N$, state $|k\rangle$ becomes state $|k \cdot c \pmod{N}\rangle$ where $N$ is the number being factored and $c = b^{2^{2n-1}} \pmod{N}$ is a classically computed constant and $b$ is the base value chosen randomly at the start of the algorithm.

$\endgroup$

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.