High-dimensional classically entangled light from a laser

• URL: http://arxiv.org/abs/2002.01585v1
• Date: Wed, 5 Feb 2020 00:24:09 GMT
• Title: High-dimensional classically entangled light from a laser
• Authors: Yijie Shen, Isaac Nape, Xilin Yang, Xing Fu, Mali Gong, Darryl Naidoo, Andrew Forbes
• Abstract summary: We invoke ray-wave duality in a simple laser cavity to produce polarization marked multi-path modes. We offer a complete theoretical framework for our laser based on SU(2) symmetry groups.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Vectorially structured light has emerged as an enabling tool in many diverse applications, from communication to imaging, exploiting quantum-like correlations courtesy of a non-separable spatially varying polarization structure. Creating these states at the source remains challenging and is presently limited to two-dimensional vectorial states by customized lasers. Here we invoke ray-wave duality in a simple laser cavity to produce polarization marked multi-path modes that are non-separable in three degrees of freedom and in eight dimensions. As a topical example, we use our laser to produce the complete set of Greenberger-Horne-Zeilinger (GHZ) basis states, mimicking high-dimensional multi-partite entanglement with classical light, which we confirm by a new projection approach. We offer a complete theoretical framework for our laser based on SU(2) symmetry groups, revealing a rich parameter space for further exploitation. Our approach requires only a conventional laser with no special optical elements, is easily scaleable to higher dimensions, and offers a simple but elegant solution for at-the-source creation of classically entangled states of structured light, opening new applications in simulating and enhancing high-dimensional quantum systems.

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