Unexpected Delay in Quantum Optics Yields Photon Pair Generation Introduction to Spontaneous Parametric Down-Conversion (SPDC) What is SPDC? S pontaneous parametric down-conversion (SPDC), first realized in the 1960, has played a pivotal role in quantum o p tics, under pinning ex periments in quantum mechanics and a p plications like cry ptogra phy, metrology, and simulation. How SPDC Works SPDC refers to the s pontaneous division of a photon into two photons u pon passing through a nonlinear medium, such as s pecific crystals. This instantaneous, nonlinear process ensures the signal and idler photons conserve the energy and momentum of the original pum p photon. S pecially designed crystals are often em ployed in SPDC to generate entangled photon pairs. The Discovery of Gain-Induced Group Delay in Photon Pair Generation The Role of the Canadian Research Team A Canadian research team has identified a delay in dete...
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