Quantum control of polaron states in semiconductor quantum dots

TL;DR

This paper investigates phonon-induced decoherence in semiconductor quantum dots and demonstrates that tailored laser pulses can effectively control optical excitation despite dephasing.

Contribution

It introduces optimal control strategies to mitigate phonon-assisted dephasing in quantum dots using realistic models.

Findings

Dephasing significantly affects the optical response of quantum dots.

Optimal control pulses can suppress decoherence effects.

Complete optical control is achievable despite phonon interactions.

Abstract

We study phonon-assisted dephasing in optically excited semiconductor quantum dots within the frameworks of the independent Boson model and optimal control. Using a realistic description for the quantum dot states and the phonon coupling, we demonstrate that such dephasing has a drastic impact on the coherent optical response. We employ optimal control theory to search for control strategies that allow to fight decoherence, and show that appropriate tailoring of laser pulses allows a complete control of the optical excitation despite the phonon dephasing.