User:Maximilian Janisch/Quantum fluctuation

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In quantum physics, a quantum fluctuation (a special case of which is a vacuum state fluctuation or a vacuum fluctuation) is an informal name for the fact that multiple measurements of the same physical property of a quantum system,^{[note 1]} such as the position or the spin of a particle, may yield different results, even though the system was prepared in the same state.^[1] This is the case whenever the latter state is not an eigenvector of the operator corresponding to the observable that is measured.

It is incorrect to think of quantum fluctuations as dynamical processes in time or space^[2]

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