Decoherence effects on the generation of exciton entangled states in coupled quantum dots

TL;DR

This paper investigates how exciton-phonon interactions affect the creation of maximally entangled exciton states in coupled quantum dots, demonstrating that entanglement can be maintained despite decoherence under certain conditions.

Contribution

It provides a numerical analysis of exciton-phonon decoherence effects on entanglement generation in quantum dots, highlighting parameter regimes where entanglement is preserved.

Findings

Entanglement generation is robust within specific parameter ranges.

Decoherence effects can be mitigated with appropriate laser pulse parameters.

Maximally entangled states remain achievable despite phonon interactions.

Abstract

We report on exciton-acoustic-phonon coupling effects on the generation of exciton maximally entangled states in N=2 and 3 quantum dot systems. In particular, we address the question of the combined effect of laser pulses, appropriate for generating Bell and Greenberger-Horne-Zeilinger entangled states, together with decoherence mechanisms as provided by a phonon reservoir. By solving numerically the master equation for the optically driven exciton-phonon kinetics, we show that the generation of maximally entangled exciton states is preserved over a reasonable parameter window.