Quantum correlations in optical angle-orbital angular momentum variables

Leach, J., Jack, B., Romero, J., Jha, A. K., Yao, A. M., Franke-Arnold, S., Ireland, D. G., Boyd, R. W., Barnett, S. M. and Padgett, M. J. (2010) Quantum correlations in optical angle-orbital angular momentum variables. Science, 329(5992), pp. 662-665. (doi:10.1126/science.1190523) (PMID:20689014)

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Abstract

Entanglement of the properties of two separated particles constitutes a fundamental signature of quantum mechanics and is a key resource for quantum information science. We demonstrate strong Einstein, Podolsky, and Rosen correlations between the angular position and orbital angular momentum of two photons created by the nonlinear optical process of spontaneous parametric down-conversion. The discrete nature of orbital angular momentum and the continuous but periodic nature of angular position give rise to a special sort of entanglement between these two variables. The resulting correlations are found to be an order of magnitude stronger than those allowed by the uncertainty principle for independent (nonentangled) particles. Our results suggest that angular position and orbital angular momentum may find important applications in quantum information science.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Padgett, Professor Miles and Barnett, Professor Stephen and Jack, Mr Barry and Boyd, Professor Robert and Ireland, Professor David and Franke-Arnold, Dr Sonja and Romero, Dr Mary and Leach, Mr Jonathan
Authors: Leach, J., Jack, B., Romero, J., Jha, A. K., Yao, A. M., Franke-Arnold, S., Ireland, D. G., Boyd, R. W., Barnett, S. M., and Padgett, M. J.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Science
Publisher:American Association for the Advancement of Science
ISSN:0036-8075
ISSN (Online):1095-9203

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
474271Full-field quantum imagingMiles PadgettEngineering & Physical Sciences Research Council (EPSRC)EP/G011656/1Physics and Astronomy