Abstract
An imprecise measurement of a dynamical variable (such as a spin component) does not, in general, give the value of another dynamical variable (such as a spin component along a slightly different direction). The result of the measurement cannot be interpreted as the value of any observable that has a classical analogue.
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Peres, A. What's Wrong with These Observables?. Foundations of Physics 33, 1543–1547 (2003). https://doi.org/10.1023/A:1026000614638
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DOI: https://doi.org/10.1023/A:1026000614638