All the indistinguishable photons illuminate the array of N slits, or grating, simultaneously. If only one photon propagates, at any given time, then… - F. J. Duarte

The EPR claim of an "all values" spread in the coordinate depends on an idealized absolute and exact measurement of <math>p</math> with <math>\Delta p\ = 0</math>. Since this is physically impossible, the claim of "no physical reality" can be negated.

From an interferometric perspective, there are no mysteries... and no paradoxes... in the physics of quantum entanglement.

The longer the cavity and the narrower the beam waist, the better the beam quality of the laser emission, or
<math> |\langle x | s \rangle|^2\ = \sum_{j=1}^\N\,\Psi(r_j)^2\ +2 \sum_{j=1}^\N\,\Psi(r_j)\bigg(\sum_{m=j+1}^\N\,\Psi(r_m)cos(\Omega_m-\Omega_j)\bigg) </math>