Advances in High Dimensional Quantum Entanglement

TL;DR

This paper reviews recent advances in high-dimensional quantum entanglement, highlighting experimental techniques, technological progress, and potential applications in quantum computing and communication.

Contribution

It provides a comprehensive overview of the latest methods for generating and manipulating high-dimensional entangled systems across various degrees of freedom.

Findings

Development of new techniques for high-dimensional entanglement generation

Enhanced control over photonic quantum systems in multiple degrees of freedom

Potential applications in quantum internet and teleportation

Abstract

Since its discovery in the last century, quantum entanglement has challenged some of our most cherished classical views, such as locality and reality. Today, the second quantum revolution is in full swing and promises to revolutionize areas such as computation, communication, metrology, and imaging. Here, we review conceptual and experimental advances in complex entangled systems involving many multilevel quantum particles. We provide an overview of the latest technological developments in the generation and manipulation of high-dimensionally entangled photonic systems encoded in various discrete degrees of freedom such as path, transverse spatial modes or time/frequency bins. This overview should help to transfer various physical principles for the generation and manipulation from one to another degree of freedom and thus inspire new technical developments. We also show how purely academic questions and curiosity led to new technological applications. Here fundamental research provides the necessary knowledge for coming technologies such as a prospective quantum internet or the quantum teleportation of all information stored in a quantum system. Finally, we discuss some important problems in the area of high-dimensional entanglement and give a brief outlook on possible future developments.