- 666

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## Main Question or Discussion Point

I have read it said a few times that a photon cannot be described by a wave-function but I am not far enough along in my QFT to know why. What's the story here?

And is this the same thing as saying that one cannot answer the question "What is the probability of observing the photon in volume dV?" And if so, well, isn't a diffraction pattern on a screen a statistical expression of the probability associated with the individual photons?

And is this the same thing as saying that one cannot answer the question "What is the probability of observing the photon in volume dV?" And if so, well, isn't a diffraction pattern on a screen a statistical expression of the probability associated with the individual photons?