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could (and often does) define a photon as being the relatively localized-snip-
corpusles of propagating electromagnetic energy that are emitted and
absorbed in various quantum transitions that occur by virtue of the
interaction of the Maxwell field with the quantum dynamical system of
interest. These latter-type photons *are* things that one observes in
the lab. These latter-type photons are are of finite extent in space and
time and have a finite width of energy and momentum. Their width in
these parameters is related to the lifetime of the metastable states that
produced them.