Suppose I have an operator A. Its average is <A> and the standard deviation $$\sigma=\sqrt {<A^2>-<A>^2} $$.(adsbygoogle = window.adsbygoogle || []).push({});

I now want the standard error which is $$\sigma/\sqrt {n} $$.

I wondered what n is in quantum mechanics ? The wsvefunction is supposed to describe a single particle so it should be 1 ? Or shall we take an ensemble interpretation ?

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# Error : what is n in quantum mechanics

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