The effect of scattering on single photon transmission of optical angular momentum

Andrews, DL (2011) The effect of scattering on single photon transmission of optical angular momentum. Journal of Optics, 13 (6). ISSN 2040-8978

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Abstract

Schemes for the communication and registration of optical angular momentum depend on the fidelity of transmission between optical system components. It is known that electron spin can be faithfully relayed between exciton states in quantum dots; it has also been shown by several theoretical and experimental studies that the use of beams conveying orbital angular momentum can significantly extend the density and efficiency of such information transfer. However, it remains unclear to what extent the operation of such a concept at the single photon level is practicable—especially where this involves optical propagation through a material system, in which forward scattering events can intervene. The possibility of transmitting and decoding angular momentum over nanoscale distances itself raises other important issues associated with near-field interrogation. This paper provides a framework to address these and related issues. A quantum electrodynamical representation is constructed and used to pursue the consequences of individual photons, from a Laguerre–Gaussian beam, undergoing single and multiple scattering events in the course of propagation. In this context, issues concerning orbital angular momentum conservation, and its possible compromise, are tackled by identifying the relevant components of the electromagnetic scattering and coupling tensors, using an irreducible Cartesian basis. The physical interpretation broadly supports the fidelity of quantum information transmission, but it also identifies potential limitations of principle.

Item Type: Article
Faculty \ School: Faculty of Science > School of Chemistry
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Depositing User: Users 2731 not found.
Date Deposited: 23 Aug 2011 11:36
Last Modified: 21 Apr 2020 16:36
URI: https://ueaeprints.uea.ac.uk/id/eprint/34584
DOI: 10.1088/2040-8978/13/6/064003

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