https://www.sciencedaily.com/releases/2020/09/200904092938.htm

"The big question is, 'How fast can anything -- information, mass, energy -- move in nature?'" said Kaden Hazzard, a theoretical quantum physicist at Rice. "It turns out that if somebody hands you a material, it is incredibly difficult, in general, to answer the question."

In a study published today in the American Physical Society journal PRX Quantum, Hazzard and Rice graduate student Zhiyuan Wang describe a new method for calculating the upper bound of speed limits in quantum matter.