# Semiconductor devices for entangled photon pair generation: a review

## TL;DR

This review discusses recent advances in semiconductor devices that generate entangled photon pairs, emphasizing their physical mechanisms, characterization tools, and future potential for quantum technologies.

## Contribution

It provides a comprehensive overview of recent progress in semiconductor-based entangled photon sources, highlighting new physical processes and future development perspectives.

## Key findings

- Semiconductor devices can efficiently generate entangled photons.
- Recent progress includes novel physical mechanisms and improved device integration.
- Future developments aim at scalable quantum photonic applications.

## Abstract

Entanglement is one of the most fascinating properties of quantum mechanical systems; when two particles are entangled the measurement of the properties of one of the two allows to instantaneously know the properties of the other, whatever the distance separating them. In parallel with fundamental research on the foundations of quantum mechanics performed on complex experimental set-ups, we assist today to a bourgeoning of quantum information technologies bound to exploit entanglement for a large variety of applications such as secure communications, metrology and computation. Among the different physical systems under investigation, those involving photonic components are likely to play a central role and in this context semiconductor materials exhibit a huge potential in terms of integration of several quantum components in miniature chips. In this article we review the recent progress in the development of semiconductor devices emitting entangled photons. We will present the physical processes allowing to generate entanglement and the tools to characterize it; we will give an overview of major recent results of the last years and highlight perspectives for future developments.