Coherent control of two electrons in quantum dot arrays driven by ac fields

We present a method to control coherently the position of two interacting electrons in a one-dimensional array of four quantum dots. We investigate the dynamics of two electrons under the influence of an external oscillating electric field using Floquet theory. We show that it is possible not only to keep two electrons localized at the same dot but also to move them simultaneously from one dot to the other dot for the case of strong Coulomb interaction between them. We find that the driven system can indicate Rabi oscillations between two dots even if the dots are spatially separated.