Quantum state engineering with twisted photons via adaptive shaping of the pump beam

TL;DR

This paper introduces an experimental method for generating high-dimensional maximally entangled orbital angular momentum states of photon pairs without filtering or entanglement concentration, enabling efficient quantum communication.

Contribution

The authors demonstrate a novel adaptive shaping technique of the pump beam to produce high-dimensional entangled states with minimal postselection.

Findings

Successfully generated maximally entangled OAM states of arbitrary dimension

Reduced need for filtering and entanglement concentration

Enhanced control over the dimensionality of entangled states

Abstract

High-dimensional entanglement is a valuable resource for quantum communication, and photon pairs entangled in orbital angular momentum are commonly used for encoding high-dimensional quantum states. However, methods for preparation of maximally entangled states of arbitrary dimensionality are still lacking, and currently used approaches essentially rely on filtering and entanglement concentration. Here we experimentally realize a method for generation of high-dimensional maximally entangled OAM states of photon pairs which does not require any of these procedures. Moreover, the prepared state is restricted to the subspace of the specified dimensionality, thus requiring minimal postselection.