After 30 years of research, a team from the “Circuits et Matériaux Quantiques” international associated laboratory, led by researchers from the CNRS and Université de Sherbrooke, has just discovered a universal law for the electronic properties of high-temperature superconductors. Strikingly, this speed limit is linked to the numerical value of Planck’s constant, the fundamental quantity of quantum mechanics representing the smallest possible action that can be taken in nature.