We are developing a semi-classical model to explain the physical processes behind the origin of the statistical variationsin the photoelectron current pulses that we register for different kinds of light. They are: super-Poissonian thermal light,Poissonian laser light and sub-Poissonian nonlinearly generated light. Einstein’s photoelectron equation is an energybalancing equation. It does not incorporate the E-vector stimulation process before the quantum mechanically boundelectrons can be released, which constitutes a key objective of physics. To introduce physics, we postulate that thephotons are hybrid entities. They are discrete packets of energy hν_(mn) at the moment of emission. Then they immediatelyevolve into spatially spreading diffractive wave packets to accommodate Huygens-Fresnel principle. HF principle hasbeen behind the sustained progress in classical optics and photonics engineering. Thus a spatially spread out singlewave-packet cannot any more deliver the necessary quantum cupful of energy hν_(mn) to Angstrom-size detecting atoms.We need simultaneous stimulation of the same quantum entity by multiple wave packets. This model of physicalinteraction process naturally brings into play the significance of the degree of mutual coherence between differentphoton wave packets, along with their time varying amplitudes that are simultaneously stimulating the detectingquantum entities during any time-interval selected for the detection system. The superposition effects on the detector dueto these phase and amplitude fluctuations are the physics-reasons behind the generation of different statistical variationsin the photoelectron counts due to different kinds of sources even though the original photons are released randomly byall quantum sources.
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