The study of interactions involving two incoming photons. Channels include elastic light-by-light scattering and pair production. A nonlinear response in a material and the direct vacuum QED process have different physical mechanisms.
Two-photon physics refers to a branch of quantum physics that involves the interaction of two photons, which are particles of light. This area of study is particularly important in understanding various phenomena in quantum optics, quantum information, and fundamental physics.
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