Electrical control of the exciton-biexciton splitting in a single self-assembled InGaAs quantum dots

TL;DR

This paper demonstrates electrical tuning of exciton-biexciton energy splitting in single InGaAs quantum dots, enabling potential on-demand entangled photon pair generation through the quantum confined Stark effect.

Contribution

It introduces a method to electrically control exciton-biexciton splitting in quantum dots, supported by theoretical calculations, advancing quantum photonics applications.

Findings

Electrical tuning of exciton-biexciton splitting achieved

Resonance between exciton and biexciton states demonstrated

Potential for entangled photon pair generation without fine structure suppression

Abstract

We report on single InGaAs quantum dots embedded in a lateral electric field device. By applying a voltage we tune the neutral exciton transition into resonance with the biexciton using the quantum confined Stark effect. The results are compared to theoretical calculations of the relative energies of exciton and biexciton. Cascaded decay from the manifold of single exciton-biexciton states has been predicted to be a new concept to generate entangled photon pairs on demand without the need to suppress the fine structures splitting of the neutral exciton.