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I had the same doubt when I started learning QM. Although my explanation to this is vaque, but it gives a general idea.(I found this on Introduction to Qunatum Mechanics, David J Griffith) Ordinarily, when you measure an observable Q on an ensemble of identically prepared systems, all in the same state $\Psi$, you do not get the same result each time. Let us ...


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The confusion arises because they say if no measurement is made then the cat in Schrodinger's box is in a state of being dead and alive at the same time. The difficulty arises because all quantum equations involve an experiment with a measurement. So if no measurement is made as in the cat in the box then the equation does not apply. You have to make the ...


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