Electric field control and optical signature of entanglement in quantum dot molecules

TL;DR

This paper demonstrates how an external electric field can tune the entanglement between an electron and a hole in quantum dot molecules, with optical signatures enabling spectroscopic detection of optimal entanglement conditions.

Contribution

It introduces a method to control and detect entanglement in quantum dot molecules using electric fields and optical spectroscopy, combining atomistic calculations with many-body analysis.

Findings

Entanglement is tunable by electric field.

Optical absorption spectra reveal entanglement levels.

A novel spectroscopic detection method is proposed.

Abstract

The degree of entanglement of an electron with a hole in a vertically coupled self-assembled dot molecule is shown to be tunable by an external electric field. Using atomistic pseudopotential calculations followed by a configuration interaction many-body treatment of correlations, we calculate the electronic states, degree of entanglement and optical absorption. We offer a novel way to spectroscopically detect the magnitude of electric field needed to maximize the entanglement.