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Quantum instrument
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Physics
Branch of physics
Quantum theory
Quantum measurement
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2026-09-28
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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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Quantum measurement
Quantum theory
Branch of physics
Physics
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