# Stimulated Emission Tomography: Beyond Polarization

## TL;DR

This paper demonstrates stimulated emission tomography as a versatile tool for characterizing hyper-entangled photon states across multiple degrees of freedom, including polarization and path, in higher-dimensional Hilbert spaces.

## Contribution

It extends stimulated emission tomography beyond polarization to include path entanglement, enabling characterization of complex hyper-entangled states.

## Key findings

- Successful characterization of hyper-entangled states in polarization and path
- Extension of stimulated emission tomography to higher-dimensional states
- Potential for studying complex quantum systems in higher dimensions

## Abstract

In this work we demonstrate the use of stimulated emission tomography to characterize a hyper-entangled state generated by spontaneous parametric down-conversion in a CW-pumped source. In particular, we consider the generation of hyper-entangled states consisting of photon pairs entangled in polarisation and path. These results extend the capability of stimulated emission tomography beyond the polarisation degree of freedom, and demonstrate the use of this technique to study states in higher dimension Hilbert spaces.