AUTHOR=Puentes Graciana 

TITLE=High-Dimensional Entanglement of Photonic Angular Qudits

JOURNAL=Frontiers in Physics

VOLUME=10

YEAR=2022

URL=https://www.frontiersin.org/journals/physics/articles/10.3389/fphy.2022.868522

DOI=10.3389/fphy.2022.868522

ISSN=2296-424X

ABSTRACT=<p>We propose a method for generation of entangled photonic states in high dimensions, the so-called qudits, by exploiting quantum correlations of Orbital Angular Momentum (OAM) entangled photons, produced via Spontaneous Parametric Down Conversion. Diffraction masks containing <italic>N</italic> angular slits placed in the path of twin photons define a qudit space of dimension <italic>N</italic><sup>2</sup>, spanned by the alternative pathways of OAM-entangled photons. We quantify the high-dimensional entanglement of path-entangled photons by the Concurrence, using an analytic expression valid for pure states. We report numerical results for the Concurrence as a function of the angular aperture size for the case of high-dimensional OAM entanglement and for the case of high-dimensional path entanglement, produced by <italic>N</italic> × <italic>M</italic> angular slits. Our results provide additional means for preparation and characterization of entangled quantum states in high-dimensions, a fundamental resource for quantum simulation and quantum information protocols.</p>