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Résumé : SPDC is a process commonly used in quantum optics to produce entangled photon pairs. It typically occurs in a nonlinear optical material (such as a beta barium borate (BBO) crystal), where a single high-energy photon (like a laser photon) interacts with the crystal and is down-converted into two lower-energy photons. These photons are often entangled in terms of properties like polarization, momentum, or phase. We also determine the probability of their entanglement and correlated behavior.