Selective coherent destruction of tunneling in a quantum-dot array

The coherent manipulation of quantum states is one of the main tasks required\nin quantum computation. In this paper we demonstrate that it is possible to\ncontrol coherently the electronic position of a particle in a quantum-dot\narray. By tuning an external ac electric field we can selectively suppress the\ntunneling between dots, trapping the particle in a determined region of the\narray. The problem is treated non-perturbatively by a time-dependent\nHamiltonian in the effective mass approximation and using Floquet theory. We\nfind that the quasienergy spectrum exhibits crossings at certain field\nintensities that result in the selective suppression of tunneling.\n