  Quantum entanglement generation is generally known to be impossible by any
classical means. According to Poisson statistics, coherent photons are not
considered quantum particles due to the bunching phenomenon. Recently, a
coherence approach has been applied to interpret quantum features such as the
Hong-Ou-Mandel (HOM) effect, Franson-type nonlocal correlation, and
delayed-choice quantum eraser, where the quantum feature is due to
basis-product superposition at the cost of 50 % photon loss. For this, it has
been understood that a fixed sum-phase relation between paired photons is the
bedrock of quantum entanglement. Here, coherently driven quantum features of
the HOM effects are presented using linear optics-based polarization-basis
control. Like quantum operator-based destructive interference in the HOM
theory, a perfectly coherent analysis shows the same photon bunching of the
paired coherent photons on a beam splitter, whereas individual output
intensities are uniform.
