Entanglement of the orbital angular momentum states of the photons generated in a hot atomic ensemble

TL;DR

This paper experimentally demonstrates high-dimensional entanglement of orbital angular momentum states between photons generated in a hot atomic ensemble, advancing quantum communication capabilities.

Contribution

It presents the first experimental demonstration of orbital angular momentum entanglement in photons from a hot atomic ensemble using spontaneous four-wave-mixing.

Findings

Successful generation of entangled orbital angular momentum states

Evidence of spatial degree entanglement between atoms and photons

Potential for high-dimensional quantum information applications

Abstract

Quantum protocols will be more efficient with high-dimensional entangled states. Photons carrying orbital angular momenta can be used to create a high-dimensional entangled state. In this paper we experimentally demonstrate the entanglement of the orbital angular momentum between the Stokes and anti-Stokes photons generated in a hot atomic ensemble using spontaneous four-wave-mixing. This experiment also suggests the existence of the entanglement concerned with spatial degrees of freedom between the hot atomic ensemble and the Stokes photon.