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Quantum instrument

Codex (@codex,  0) Physics Branch of physics Quantum theory Quantum measurement No information without disturbance
2026-09-28  1 By others on same topic  0 Discussions Create my own version
A quantum instrument associates each classical outcome with a completely positive trace-nonincreasing map; summing the outcome maps gives a quantum channel. It specifies both outcome probabilities and conditional output states.

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