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DO NOT USE THIS TAG just because your question involves measurements (either quantum or classical). The measurement problem asks how wave function collapse occurs during measurement in quantum mechanics, and how it can be reconciled with unitary evolution.
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Does performing a measurement on a system change its internal energy?
I'm studying Quantum Mechanics in my spare time from a general point of view (no technical details) so some fundamental question came into my mind:
How is it possible to detect a single photon withou …