Selective coherent destruction of tunneling in a quantum-dot array

摘要

The coherent manipulation of quantum states is one of the main tasks requiredin quantum computation. In this paper we demonstrate that it is possible tocontrol coherently the electronic position of a particle in a quantum-dotarray. By tuning an external ac electric field we can selectively suppress thetunneling between dots, trapping the particle in a determined region of thearray. The problem is treated non-perturbatively by a time-dependentHamiltonian in the effective mass approximation and using Floquet theory. Wefind that the quasienergy spectrum exhibits crossings at certain fieldintensities that result in the selective suppression of tunneling.