Pfleegor and Mandel produced interference effects from two separate independent laser beams when the quanta arriving at the detector were separated in time by an average of about 1.4×${10}^{-7\mathrm{}}$ sec. If the quanta are photons (particles), then, to produce interference, each photon must store energy in the detector for an average of at least 1.4×${10}^{-7\mathrm{}}$ sec. But Jánossy and Náray have recently shown that over a period of 9×${10}^{-9\mathrm{}}$ sec there is no such storage, at least when the phases are random. Thus the result of Pfleegor and Mandel is in conflict with the corpuscular concept of visible light.

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