Orbital Angular Momentum embedded Einstein Podolsky Rosen Entanglement Generated from Cold Atoms

TL;DR

This paper reports the first experimental demonstration of EPR entanglement in photon pairs carrying orbital angular momentum, revealing high-dimensional hyper entanglement and phase-dependent ghost interference.

Contribution

It introduces the first experimental realization of OAM-embedded EPR entanglement, expanding the scope of entangled states with structured wave fronts.

Findings

Demonstrated EPR entanglement with OAM-carrying photons

Observed phase-dependent ghost interference dynamics

Reconstructed hyper-entangled state in high-dimensional OAM and position-momentum spaces

Abstract

The Einstein Podolsky Rosen (EPR) entangled quantum state is of special importance not only for fundamental research in quantum mechanics, but also for information processing in the field of quantum information. Previous EPR entangled state demonstrations were constructed with photons of equal phase wave fronts. More complex scenarios with structured wave fronts have not been investigated. Here, we report the first experimental demonstration of EPR entanglement for photon pairs carrying orbital angular momentum (OAM) information, resulting in an OAM embedded EPR entangled state. We measured the dynamics of the dependence of the ghost interference on relative phase under projection. In addition, the reconstructed matrix in the OAM and EPR position momentum spaces shows a specific hyper entanglement in high dimension.