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The Strathprints institutional repository is a digital archive of University of Strathclyde research outputs.

Strathprints serves world leading Open Access research by the University of Strathclyde, including research by the Strathclyde Institute of Pharmacy and Biomedical Sciences (SIPBS), where research centres such as the Industrial Biotechnology Innovation Centre (IBioIC), the Cancer Research UK Formulation Unit, SeaBioTech and the Centre for Biophotonics are based.

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Quantum correlations in optical angle-orbital angular momentum variables

Leach, Jonathan and Jack, Barry and Romero, Jacqui and Jha, Anand K. and Yao, Alison M. and Franke-Arnold, Sonja and Ireland, David G. and Boyd, Robert W. and Barnett, Stephen M. and Padgett, Miles J. (2010) Quantum correlations in optical angle-orbital angular momentum variables. Science, 329 (5992). pp. 662-665. ISSN 0036-8075

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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.