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Physics
Quantum Physics
Quantum Interpretations and Foundations
Quantum Physics via Quantum Tomography: A New Approach to Quantum Mechanics
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[QUOTE="vanhees71, post: 6585658, member: 260864"] The point is the interpretation. In the latter formulation, that's precisely what I mean when I say that ##\hat{\rho}## is an "equivalence class of preparation procedures". It's an equivalence class, because very different equipment can result in the same "emanating beam". This I don't understand: A single measurement leads to some random result, but not the expectation value of these random results. Now I'm completely lost again. In the usual formalism the statistical operator refers to the quantum state and not to an observable. To determine a quantum state you need more than one measurement (of a complete set of compatible observables). See Ballentine's chapter (Sect. 8.2) on "state determination". [/QUOTE]
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Quantum Physics via Quantum Tomography: A New Approach to Quantum Mechanics
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