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. 2019 Oct 2;8:90. doi: 10.1038/s41377-019-0194-2

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© The Author(s) 2019

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 17 — a OAM-entanglement photon pairs generated by the spontaneous parametric down conversion process. b Quantum tomography experimental data demonstrating that the OAM of the pump beam is transferred to the sum of the OAM of the generated photons (m_p = m₁ + m₂)³¹. c Setup for quantum digital spiral imaging²⁴³. Comparison between quantum communication using d entangled photons and e non-separable states of vector OVs²⁵⁰. b Reprinted by permission from Springer Nature: Nature Physics³¹, Copyright (2019). c Reprinted by permission from Springer Nature: Light: Science & Applications²⁴³, Copyright (2019). d, e Reprinted by permission from Springer Nature: Nature Physics²⁵⁰, Copyright (2019)