assume that i have a photon field, which is in a coherent state.(adsbygoogle = window.adsbygoogle || []).push({});

now i detect a photon of this field, i.e., my detector absorbs a photon from this field.

my question is, what state will the field collapse into?

this question may be not so trivial as the examples most quantum mechanics textbooks mention

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# What does this state collapse into after the measurement?

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