Free-space local nonseparability dynamics of parabolic vector modes

Carmelo Rosales-Guzmán; Xiao-Bo Hu; Valeria Rodríguez-Fajardo; Raúl I. Hernandez-Aranda; Andrew Forbes; Benjamin Perez-Garcia

doi:10.1117/12.2603091

1 August 2021 Free-space local nonseparability dynamics of parabolic vector modes

Carmelo Rosales-Guzmán, Xiao-Bo Hu, Valeria Rodríguez-Fajardo, Raúl I. Hernandez-Aranda, Andrew Forbes, Benjamin Perez-Garcia

Author Affiliations +

Proceedings Volume 11818, Laser Beam Shaping XXI; 1181807 (2021) https://doi.org/10.1117/12.2603091
Event: SPIE Optical Engineering + Applications, 2021, San Diego, California, United States

Abstract

It is well known that entanglement is invariant to local unitary transformations, this implies the degree of entanglement or non-separability remains constant during free-space propagation, which is true for both quantum and classically-entangled modes. Here we demonstrate an exception to this rule using a carefully engineered vectorial light field, and study its non-separability dynamics upon free-space propagation. We show that the local non-separability between the spatial and polarisation degrees of freedom dramatically decays to zero, while preserving the purity of the state and hence the global non-separability. We show this by numerical simulations and corroborate it experimentally. Our results evince novel properties of classically-entangled modes, point to the need for new measures of non-separability for such vectorial fields, while paving the way to novel applications for customised structured light.

Conference Presentation

Citation Download Citation

Carmelo Rosales-Guzmán, Xiao-Bo Hu, Valeria Rodríguez-Fajardo, Raúl I. Hernandez-Aranda, Andrew Forbes, and Benjamin Perez-Garcia "Free-space local nonseparability dynamics of parabolic vector modes", Proc. SPIE 11818, Laser Beam Shaping XXI, 1181807 (1 August 2021); https://doi.org/10.1117/12.2603091

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