We always say that we detect a single photon by a "click" response of an electron ( photodiode )! However, is this true for an existence of one photon? A single photon always indicates a very weak electromagnetic field but it doesn't mean that there is only one photon and can not be "divided" further! Photon is a non-local virtual particle and can not be physically counted. It locates everywhere unless you put a detector and receive a click, and then the photon immediately take a local meaning at the detector's position (this position is not the photon's position). This property also holds for the matter wave particles and hence we can understand quantum mechanics easily!
Yes it is a real quantity, but we cannot see it as a particle however we can feel it as a particle when your skin exposed to sun light or to mercury vapour lamp you feel warm since the interaction of particle with skin.
The energy of a photon is E=Planck's constant multiplied by frequency of a light.
The measurement problem in quantum mechanics leads to different interpretations of this theory. I really like the complex way you show the problem, thinking in terms of wave/particle duality. It should be done more often.
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