Universal finestructure eraser for quantum dots

TL;DR

This paper proposes an optical method using fast rotating waveplates to erase fine-structure splitting in quantum dots, enabling near-unity entanglement efficiency, compatible with current technology and applicable to various quantum dots.

Contribution

It introduces a practical optical technique to eliminate fine-structure splitting in quantum dots, enhancing entanglement quality for quantum information applications.

Findings

Achieves near-unity entanglement efficiency

Compatible with existing quantum dot technology

Applicable to any quantum dot with fine-structure splitting

Abstract

The measurable degree of entanglement from a quantum dot via the biexciton-exciton cascade depends crucially on the bright exciton fine-structure splitting and on the detection time resolution. Here, we propose an optical approach with fast rotating waveplates to erase this fine-structure splitting and therefore obtain a high degree of entanglement with near-unity efficiency. Our optical approach is possible with current technology and is also compatible with any quantum dot showing fine-structure splitting.