Entanglement swapping with energy-polarization entangled photons from quantum dot cascade decay

TL;DR

This paper theoretically analyzes the efficiency of entanglement swapping using quantum dot sources, considering factors like fine-structure splitting, spectral inhomogeneity, and proposing a quantum eraser approach.

Contribution

It introduces a theoretical framework for entanglement swapping with quantum dots, accounting for practical imperfections and suggesting a quantum eraser method to improve performance.

Findings

Fine-structure splitting limits interference efficiency.

Spectral inhomogeneity affects entanglement swapping.

Quantum eraser can mitigate which-path information issues.

Abstract

We theoretically investigate the efficiency of an entanglement swapping procedure based on the use of quantum dots as sources of entangled photon pairs. The four-photon interference that affects such efficiency is potentially limited by the fine-structure splitting and by the time correlation between cascaded photons, which provide which-path information. The effect of spectral inhomogeneity is also considered, and a possible quantum eraser experiment is discussed for the case of identical dots.