The phase of individual photons continues to fluctuate, which makes classical interference with other photons impossible. (thescienceexplorer.com)
This is where light - matter interaction comes into the picture: it allows some photons to control other photons. (sciencedaily.com)
But now scientists have spotted evidence of photons bouncing off other photons at the Large Hadron Collider at CERN, the European particle physics lab in Geneva. (sciencenews.org)