Abstract: Modern quantum technologies depend on our ability to understand, predict, and ultimately engineer interactions between electrons, excitons, spins, and photons. In this colloquium, I will describe a method of turning quantum materials into programmable quantum systems. I will first briefly discuss how many-body GW–Bethe–Salpeter and Kadanoff–Baym approaches provide a predictive framework for the linear and nonlinear optical response of …
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