= Spontaneous parametric down-conversion
{wiki=Spontaneous_parametric_down-conversion}
Spontaneous Parametric Down-Conversion (SPDC) is a quantum optics process in which a single photon interacts with a nonlinear crystal to produce two lower-energy photons, commonly referred to as "signal" and "idler" photons. This process is significant in quantum mechanics and quantum optics, as it is one of the primary methods for generating entangled photon pairs, which are essential for various applications in quantum information science, such as quantum cryptography, quantum computing, and quantum teleportation.
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