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This tag is for questions relating to what, if anything, the quantum mechanical formalism and experimental results say about the way the world works.
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The System and the Measuring Gadget
In Quantum Mechanics the value of an observable results from the interaction between the "system" with the "Measuring gadget".
But when the experimenter[or the technologist concerned] is devising/con …
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On Bell's Inequality (Classical Intuition) and Quantum Mechanical Counter Intuition
This posting is directly related to the issue in The System and the Measuring Gadget.
The QM expectation is given by:
$$\langle\sigma_{1}.\vec{a}{\;}\sigma_{2}.\vec b\rangle=-\vec a.\vec b$$
In the …