# Spatially correlated photonic qutrit pairs using pump beam modulation technique

## TL;DR

This paper introduces a novel method to generate spatially correlated photonic qutrit pairs by modulating the pump beam with a three-slit aperture, verified through theoretical modeling and experiments, advancing high-dimensional quantum information processing.

## Contribution

The paper presents a new scheme for approximating photonic qutrits via pump beam modulation in SPDC, demonstrating high spatial correlation and scalability for higher-dimensional quantum systems.

## Key findings

- Bi-photon fields behave like qutrits with high correlation (Pearson coefficient ~0.9)
- Experimental verification of the pump beam modulation scheme
- Potential for scalable generation of higher-dimensional qudits

## Abstract

Higher dimensional quantum systems have a very important role to play in quantum information, computation as well as communication. While the polarization degree of freedom of the photon is a common choice for many studies, it is restricted to only two orthogonal states, hence qubits for manipulation. In this paper, we theoretically model as well as experimentally verify a novel scheme of approximating photonic qutrits by modulating the pump beam in a spontaneous parametric down conversion process using a three-slit aperture. The emerging bi-photon fields behave like qutrits and are found to be highly correlated in the spatial degree of freedom and effectively represent spatially correlated qutrits with a Pearson coefficient as high as 0.9. In principle, this system provides us a scalable architecture for generating and experimenting with higher dimensional correlated qudits.