Entanglement beating in free space through spin–orbit coupling

Simple item page
dc.contributor.authorRosales-Guzmán, Carmelo
dc.contributor.authorDenz, Cornelia
dc.contributor.authorOtte, Eileen
dc.contributor.authorNdagano, Bienvenu
dc.contributor.authorForbes, Andrew
dc.date.accessioned2024-09-13T10:02:35Z
dc.date.available2024-09-13T10:02:35Z
dc.date.issued2018
dc.description.abstractIt is well known that the entanglement of a quantum state is invariant under local unitary transformations. This rule dictates, for example, that the entanglement of internal degrees of freedom of a photon remains invariant during free-space propagation. Here, we outline a scenario in which this paradigm does not hold. Using local Bell states engineered from classical vector vortex beams with non-separable degrees of freedom, the so-called classically entangled states, we demonstrate that the entanglement evolves during propagation, oscillating between maximally entangled (purely vector) and product states (purely scalar). We outline the spin–orbit interaction behind these novel propagation dynamics and confirm the results experimentally, demonstrating spin–orbit coupling in paraxial beams. This demonstration highlights a hitherto unnoticed property of classical entanglement and simultaneously offers a device for the on-demand delivery of vector states to targets, for example, for dynamic laser materials processing, switchable resolution within stimulated emission depletion (STED) systems, and a tractor beam for entanglement.
dc.description.sponsorshipGerman Research Foundation.
dc.description.sponsorshipClaude Leon foundation.
dc.description.sponsorshipNational Research Foundation of South Africa.
dc.description.submitterPM2024
dc.facultyFaculty of Science
dc.identifier0000-0002-0321-0877
dc.identifier.citationOtte, E., Rosales-Guzmán, C., Ndagano, B. et al. Entanglement beating in free space through spin–orbit coupling. Light Sci Appl 7, 18009 (2018). https://doi.org/10.1038/lsa.2018.9
dc.identifier.issn2047-7538 (online)
dc.identifier.other10.1038/lsa.2018.9
dc.identifier.urihttps://hdl.handle.net/10539/40771
dc.journal.linkhttps://www.nature.com/lsa/
dc.journal.titleLight: Science & Applications
dc.language.isoen
dc.publisherSpringer Nature
dc.relation.ispartofseriesVol. 7; a18009
dc.rights© The Author(s) 2018. This work is licensed under a Creative Commons Attribution 4.0 International License.
dc.schoolSchool of Physics
dc.subjectClassical entanglement
dc.subjectComplex light fields
dc.subjectEntanglement oscillation
dc.subjectSpin–orbit coupling
dc.subject.otherSDG-17: Partnerships for the goals
dc.titleEntanglement beating in free space through spin–orbit coupling
dc.typeArticle
Files
Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
Otte_Entanglement_2018.pdf
Size:
1.51 MB
Format:
Adobe Portable Document Format
Download
License bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
license.txt
Size:
2.43 KB
Format:
Item-specific license agreed upon to submission
Description:
Download
Collections
School of Physics (Journal Articles)