Selective coherent destruction of tunneling in a quantum-dot array

TL;DR

This paper demonstrates a method to coherently control electron localization in a quantum-dot array by tuning an external ac electric field, enabling selective suppression of tunneling through Floquet engineering.

Contribution

It introduces a non-perturbative approach using Floquet theory to achieve selective tunneling suppression in quantum-dot arrays.

Findings

Tunneling can be selectively suppressed at specific field intensities.

Quasienergy spectrum crossings enable control over electron localization.

The method allows coherent manipulation of quantum states in quantum-dot systems.

Abstract

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