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Feynman uses Dirac's notation to describe the quantum mechanics of stimulated emission... he applies that physics to... dye molecules... In this regard, Feynman could have predicted the existence of the tunable laser.
— 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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