# Accessing higher order correlations by time-multiplexing

## TL;DR

This paper presents an experimental method using time-multiplexing detectors to measure higher order correlation functions of pulsed light, verifying quantum properties and nonclassicality in various light sources.

## Contribution

It introduces a novel measurement technique for higher order correlations using time-multiplexing, enabling detailed analysis of quantum light sources.

## Key findings

- Verified unity-valued nCF up to eighth order for coherent light
- Demonstrated factorial dependence of nCF for pseudothermal light
- Investigated nonclassical correlations in parametric downconversion source

## Abstract

We experimentally measured higher order normalized correlation functions (nCF) of pulsed light with a time-multiplexing-detector. We demonstrate excellent performance of our device by verifying unity valued nCF up to the eighth order for coherent light, and factorial dependence of the nCF for pseudothermal light. We applied our measurement technique to a type-II parametric downconversion source to investigate mutual two-mode correlation properties and ascertain nonclassicality.