# Single-photon source based on Rydberg exciton blockade

## TL;DR

This paper proposes a solid-state single-photon source utilizing Rydberg exciton blockade in cuprous oxide, promising GHz emission rates and high single-photon purity due to strong exciton interactions.

## Contribution

It introduces a novel single-photon source design based on Rydberg exciton blockade, with quantitative estimates of high rate and low multi-photon probability.

## Key findings

- Achieves GHz emission rates for single-photon sources
- Predicts $g_2(0)$ below 1% indicating high single-photon purity
- Demonstrates feasibility of solid-state Rydberg exciton-based devices

## Abstract

We propose to implement a new kind of solid-state single-photon source based on the recently observed Rydberg blockade effect for excitons in cuprous oxide. The strong interaction between excitons in levels with high principal quantum numbers prevents the creation of more than one exciton in a small crystal. The resulting effective two-level system is a good single-photon source. Our quantitative estimates suggest that GHz rates and values of the second-order correlation function $g_2(0)$ below the percent level should be simultaneously achievable.