Coulomb-enhanced dynamic localization and Bell state generation in coupled quantum dots

TL;DR

This paper explores how AC fields can induce Coulomb-enhanced localization and enable Bell state generation in coupled quantum dots, providing insights into controlling electron dynamics and entanglement.

Contribution

It demonstrates that AC fields can trap electrons and enhance localization despite Coulomb repulsion, and introduces a method to generate Bell states in quantum dots.

Findings

Electrons can be localized in one dot despite Coulomb repulsion.

AC fields can enhance electron localization in coupled quantum dots.

Bell states can be generated through field excitation with predictable timing.

Abstract

We investigate the dynamics of two interacting electrons in coupled quantum dots driven by an AC field. We find that the two electrons can be trapped in one of the dots by the AC field, in spite of the strong Coulomb repulsion. In particular, we find that the interaction may enhance the localization effect. We also demonstrate the field excitation procedure to generate the maximally entangled Bell states. The generation time is determined by both analytic and numerical solutions of the time dependent Schrodinger equation.