Talk:Swap test

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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)[reply]