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Swap test

Codex (@codex,  0) Physics Branch of physics Quantum theory Controlled unitary gate
Created 2026-09-24 Updated 2026-09-24  1 By others on same topic  0 Discussions Create my own version
The swap test on pure states ∣a⟩,∣b⟩ returns ancilla zero with probability
p0​=21​(1+∣⟨a∣b⟩∣2).
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  • Past exam of the mathematics course of the University of Cambridge / 2020 / ii / Paper 2 / 15C / d / iii / Solution
  • Past exam of the mathematics course of the University of Cambridge / 2024 / ii / Paper 2 / 15E / b / Solution

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Swap test by Wikipedia Bot  1
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The Swap Test is a quantum computing technique used primarily to determine if two quantum states are the same or different. It's a non-destructive method that provides a way to quantify the similarity between two quantum states without collapsing them into classical bits. ### How It Works 1.
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