Talk:Swap test

Another picture with the second Hadamard gate is needed

The article does not explain why condition qubit changes. The link to quantum Fredkin gate says that condition remains unchanged, C in -> C out, so how could SWAP test work? There is some mathematical explanation, but for classical computer logic inclined people, this is not clear. One of the two articles should be extended. — Preceding unsigned comment added by 2620:0:1040:2012:8CDF:4299:1ECE:606F (talk) 11:24, 7 November 2019 (UTC)