To give an idea how accurately these things can be used, the quantum computer group at the local university use piezo actuators to move their ions around with sub-100nm resolution (to create fast interconnects between quantum chips, for reasons of modularity). Got lucky enough to have a demo/playtime (which involved pushing rubidium ions around a few nanometres at a time) before they went commercial [0] with it. As Feynman said, "plenty of room at the bottom".

[0] https://thequantuminsider.com/2022/11/02/universal-quantum-s...