On the nanoscale transmission of quantum angular momentum

Andrews, Davıd L.

doi:10.1117/12.860584

Cited by 4 publications

(2 citation statements)

References 30 publications

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“…Such a phenomenon would, indeed, be consistent with the effects of rotating optical elements. [34] It is also interesting to reflect on certain similarities of feature in the resonance transfer of energy between spin-selected states in quantum dots, [35] a congruence that arises from the quantum amplitude for each process involving a term of identical mathematical structure to the factor cast in square brackets in equation (11). It has been shown that the quantum dot spin and energy transfer process provides for a complete fidelity of spin transmission only in cases where the initial electron spin is aligned, parallel or anti-parallel, with the pair displacement vector.…”

Section: Resultsmentioning

confidence: 99%

Structured light, transmission, and scattering

Andrews

2011

SPIE Proceedings

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Numerous theoretical and experimental studies have established the principle that beams conveying orbital angular momentum offer a rich scope for information transfer. However, it is not clear how far it is practicable to operate such a concept at the single-photon level -especially when such a beam propagates through a system in which scattering can occur. In cases where scattering leads to photon deflection, it produces losses; however in terms of the retention of information content, there should be more concern over forward scattering. Based on a quantum electrodynamical formulation of theory, this paper aims to frame and resolve the key issues. A quantum amplitude is constructed for the representation of single and multiple scattering events in the propagation an individual photon, from a suitably structured beam. The analysis identifies potential limitations of principle, undermining complete fidelity of quantum information transmission.

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Section: Resultsmentioning

confidence: 99%

Structured light, transmission, and scattering

Andrews

2011

SPIE Proceedings

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“…On this well-established basis the present analysis aims to deliver a construct that is entirely rigorous, robust and well suited for describing the interpretable transmission of quantum optical angular momentum. Developing and expanding on the approach of a preliminary study [38] communicated in a recent conference, the theory identifies the effects and limitations imposed by scattering in any material medium, eliciting new physical insights into the underlying photonics.…”

Section: Introductionmentioning

confidence: 99%

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

Andrews¹

2011

J. Opt.

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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.

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Chiral nanoemitter array: A launchpad for optical vortices

Coles

Williams

Saadi

et al. 2013

Laser & Photonics Reviews

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A chiral arrangement of molecular nanoemitters is shown to support delocalised exciton states whose spontaneous decay can generate optical vortex radiation. In contrast to techniques in which phase modification is imposed upon conventional optical beams, this exciton method enables radiation with a helical wave-front to be produced directly. To achieve this end, a number of important polarisation and symmetry-based criteria need to be satisfied. It emerges that the phase structure of the optical field produced by degenerate excitons in a propeller-shaped array can exhibit precisely the sought character of an optical vortex -one with unit topological charge. Practical considerations for the further development of this technique are discussed, and potential new applications are identified.

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On the nanoscale transmission of quantum angular momentum

Cited by 4 publications

References 30 publications

Structured light, transmission, and scattering

Structured light, transmission, and scattering

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

Chiral nanoemitter array: A launchpad for optical vortices

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