Verification of high-dimensional entanglement generated in quantum interference

TL;DR

This paper demonstrates the generation and verification of high-dimensional hyperentanglement in polarization and frequency degrees of freedom using quantum interference, advancing practical quantum information processing capabilities.

Contribution

It introduces a method to engineer and verify high-dimensional entanglement across multiple degrees of freedom using quantum interference on a beam splitter.

Findings

Successful generation of hyperentanglement in polarization and frequency

Verification of high-dimensional entanglement in combined state space

Potential for enhanced quantum information protocols

Abstract

Entanglement and quantum interference are key ingredients in a variety of quantum information processing tasks. Harnessing the generation and characterization of entanglement in high-dimensional state spaces is a necessary prerequisite towards practical quantum protocols. Here, we use quantum interference on a beam splitter to engineer hyperentanglement in polarization and discrete frequency degrees of freedom (DOF). We show how independent measurements of polarization and frequency DOF allow for the verification of high-dimensional entanglement in the combined state space. These results may indicate new paths towards practical exploitation of entanglement stored in multiple degrees of freedom, in particular in the context of high-dimensional quantum information processing protocols.