# Nonclassical light from large ensemble of trapped ions

## TL;DR

This paper demonstrates nonclassical light emission from large ensembles of trapped ions, showing scalability of quantum light sources and broad applicability of the methodology to various platforms.

## Contribution

It presents the first large-scale demonstration of nonclassical light from ensembles of over a thousand ions, advancing scalable quantum light sources.

## Key findings

- Nonclassical statistics observed from ensembles with over a thousand ions
- Methodology applicable to various experimental platforms
- Scalability of nonclassical light emission demonstrated

## Abstract

The vast majority of physical objects we are dealing with are almost exclusively made of atoms. Due to their discrete level structure, single atoms have proved to be emitters of light which is incompatible with the classical description of electromagnetic waves. We demonstrate this incompatibility for atomic fluorescence when scaling up the size of the source ensemble, which consists of trapped atomic ions, by several orders of magnitude. The presented measurements of nonclassical statistics on light unconditionally emitted from ensembles containing up to more than a thousand ions promise further scalability to much larger emitter numbers. The methodology can be applied to a broad range of experimental platforms focusing on the bare nonclassical character of single isolated emitters.