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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.

— F. J. Duarte

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Nature

More quotes by F. J. Duarte

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^- .

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.

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Quote text and notes from Wikiquote: F. J. Duarte (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.