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For questions about quantum foundations. Examples include questions about fundamental axioms, interpretations, contextuality, or generalized probabilistic theories.
5
votes
Prove that if Kraus operators of Φ form an ONB then Φ is the replacement map
This solution uses the spectral theorem and some elementary linear algebra computations. If you let P=∑d′i=1λi|ψi⟩⟨ψi| be the spectral decomposi …