"As we apply the results obtained in this section, we should remember that common terms like "measurement" and "information" are being used here with a specific technical meaning. In particular, this is not the place for a detailed analysis of real experimental measurements and their relation to the theoretical framework. We merely note that, in the information theoretic view of quantum mechanics, the probabilities and the related density operators and entropies, which are employed to assess the properties of quantum states and the outcomes of measurement, provide a coherent and consistent basis for understanding and interpreting the theory."
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Eugen Merzbacher, Quantum Mechanics (1998)
https://en.wikiquote.org/wiki/Measurement_in_quantum_mechanics
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Measurement in quantum mechanics
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