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Physics
Quantum Physics
Quantum Interpretations and Foundations
Ensembles in quantum field theory
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[QUOTE="vanhees71, post: 6823960, member: 260864"] The statistical operator can of course be everything meeting the conditions, not only the vacuum state. In equilibrium you can use the canonical or grand-canonical statistical operator ##\propto \exp(-\beta \hat{H}+\alpha \hat{Q})##. It depends on the detector. What you have in mind most probably is described by ##N##-point auto-correlation functions of the charge density. Sure, but that you can mimic by using some external (classical) source and solve for the operator Klein-Gordon equation (or whatever equation you want to use to describe silver atoms) such that you get your (operator-valued) wave packets with at different times around some place. More realistic is mimicking the original setup by using a beam of thermal Ag atoms emitted from an oven at temperature ##T##. Then the initial state is the corresponding stat. op. describing this thermal beam coming out of the oven. Sure, you always have to simplify the description sufficiently to be able to describe anything. The Sun is in a sense simple, because you can describe it as a fireball of plasma in thermal equilibrium held together by gravitation. [/QUOTE]
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Quantum Interpretations and Foundations
Ensembles in quantum field theory
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