I guess it's inevitable that we'll reach a "hard" limit at some point, with exponential increase in density (electrons and photons have a "size"). But I don't k

I guess it's inevitable that we'll reach a "hard" limit at some point, with exponential increase in density (electrons and photons have a "size"). But I don't know how that translates to current densities (how many atoms in a gate on the Apple m1 chips, and what is the theoretical minimum?).