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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 downconversion. 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.
Original language  English 

Pages (fromto)  662665 
Number of pages  4 
Journal  Science 
Volume  329 
Issue number  5992 
DOIs  
Publication status  Published  6 Aug 2010 
Keywords
 podolskyrosen paradox
 parametric downconversion
 laserbeams
 light
 position
 entanglement
 realization
 violation
 photons
 entropy
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Dive into the research topics of 'Quantum correlations in optical angleorbital angular momentum variables'. Together they form a unique fingerprint.Projects
 1 Finished

Fullfield Coherent Quantum Imaging
Barnett, S.
EPSRC (Engineering and Physical Sciences Research Council)
1/04/08 → 31/05/12
Project: Research