Free-space information transfer using light beams carrying orbital angular momentum

Gibson, G., Courtial, J. , Padgett, M. J. , Vasnetsov, M., Pas'ko, V., Barnett, S. M. and Franke-Arnold, S. (2004) Free-space information transfer using light beams carrying orbital angular momentum. Optics Express, 12(22), pp. 5448-5456. (doi: 10.1364/OPEX.12.005448)

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We demonstrate the transfer of information encoded as orbital angular momentum (OAM) states of a light beam. The transmitter and receiver units are based on spatial light modulators, which prepare or measure a laser beam in one of eight pure OAM states. We show that the information encoded in this way is resistant to eavesdropping in the sense that any attempt to sample the beam away from its axis will be subject to an angular restriction and a lateral offset, both of which result in inherent uncertainty in the measurement. This gives an experimental insight into the effects of aperturing and misalignment of the beam on the OAM measurement and demonstrates the uncertainty relationship for OAM.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Courtial, Dr Johannes and Padgett, Professor Miles and Franke-Arnold, Professor Sonja
Authors: Gibson, G., Courtial, J., Padgett, M. J., Vasnetsov, M., Pas'ko, V., Barnett, S. M., and Franke-Arnold, S.
Subjects:Q Science > QC Physics
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Optics Express
Publisher:Optical Society of America
ISSN (Online):1094-4087

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
388331Graph-based methods for the analysis of biochemical structuresDavid GilbertEngineering & Physical Sciences Research Council (EPSRC)EP/C00373X/1Computing Science
331501Multi-dimensional quantum entanglement and high density information transferMiles PadgettEngineering & Physical Sciences Research Council (EPSRC)GR/S03904/01P&A - PHYSICS & ASTRONOMY