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The Dirac notation, though originally applied to the propagation of single particles, also applies to describing the propagation of ensembles of coherent, or indistinguishable, photons.
— F. J. Duarte
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The intimate relation between interference and diffraction has its origin in the interference equation itself.
Personally, I find the concept of a "final theory," or a "theory of everything," rather limiting. The fun of discovery will most likely last as long as the human race continues.
All the indistinguishable photons illuminate the array of N slits, or grating, simultaneously. If only one photon propagates, at any given time, then that individual photon illuminates the whole array of N slits simultaneously.
As noted previously Bell's theorem is completely disconnected from the physics leading to |\psi\rangle_+, |\psi\rangle_-, |\psi\rangle^+, and |\psi\rangle^- .
Regardless of the prophetic value of Dirac’s description [on interference] his was probably the first discussion... including a coherent beam of light. In other words, Dirac wrote the first chapter in laser optics.
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