They say we can't get smaller than an atom, but electrons are smaller than an atom, and we don't even have to use just the charge but can also use properties li

They say we can't get smaller than an atom, but electrons are smaller than an atom, and we don't even have to use just the charge but can also use properties like spin and momentum to get more values out of them. I.e. spintronics. Then of course there are photons as well. The article mentions itself that we use light for etching features even less than the wavelength of the light nowadays. Sometimes you need a big read-write head or something, but then you can just push magnetic domains past it on a wire, etc. so that isn't necessarily the size of piece of computation in the device if we move beyond transistors.