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" ... Cascade sources work, but they're pretty slow because each atom shoots photons out in random directions, so getting two photons sent in the right directions to hit your detectors can take a while. The quantum-entanglement business was revolutionized by the development of "parametric downconversion" sources, which use non-linear optical crystals to convert single high-energy photons into pairs of photons with half the initial energy. A violet laser shining into one of these crystals (the most common material used is "beta barium borate" or "BBO") will produce a small number of pairs of near-infrared photons. There's still a bit of randomness to the process, but conservation of momentum requires that the pairs come out on opposite sides of a cone around the original laser beam, allowing you to put two detectors in exactly the right place to catch the photons. And with the proper arrangement of the crystal (actually two thin crystals stuck together in the right way), the polarizations of the two photons will be correlated in exactly the way you need to demonstrate entanglement. ... "
" ... Designed using parametric modeling—a software-based method that involves attaching a series of formulas to key design parameters (i.e. floor areas, frontages, and specific building heights and setbacks)—the tower was tailored to maximize views and minimize the effects of wind downdraft and oscillation frequency. ... "
" ... THREAD: Artists’ Residency and Cultural Center, Toshiko Mori, Sinthian, Senegal, 2015. Image credit: ... [+] Photos: Iwan Baan. A parametric transformation of the region’s traditional pitched roof is achieved through a process of inversion. The bamboo and thatch were harvested nearby by a team of local builders and artisans, thus allowing for ease of repair. ... "
" ... “We didn’t ever intend to just be a builder of homes,” Goodjohn said. “We haven’t perfected manufacturing yet, but we get a hell of a lot better every day. With our next capital raise we want to automate the factory more. We do it all in parametric modeling and we spend a lot in getting all the homes fully digitized.” ... "