Experimental high-dimensional two-photon entanglement and violations of generalized Bell inequalities

Dada, A. C., Leach, J., Buller, G. S., Padgett, M. J. and Andersson, E. (2011) Experimental high-dimensional two-photon entanglement and violations of generalized Bell inequalities. Nature Physics, 7(9), pp. 677-680. (doi:10.1038/nphys1996)

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Publisher's URL: http://dx.doi.org/10.1038/nphys1996

Abstract

Quantum entanglement1, 2 plays a vital role in many quantum-information and communication tasks3. Entangled states of higher-dimensional systems are of great interest owing to the extended possibilities they provide. For example, they enable the realization of new types of quantum information scheme that can offer higher-information-density coding and greater resilience to errors than can be achieved with entangled two-dimensional systems (see ref. 4 and references therein). Closing the detection loophole in Bell test experiments is also more experimentally feasible when higher-dimensional entangled systems are used5. We have measured previously untested correlations between two photons to experimentally demonstrate high-dimensional entangled states. We obtain violations of Bell-type inequalities generalized to d-dimensional systems6 up to d=12. Furthermore, the violations are strong enough to indicate genuine 11-dimensional entanglement. Our experiments use photons entangled in orbital angular momentum7, generated through spontaneous parametric down-conversion8, 9, and manipulated using computer-controlled holograms.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Padgett, Professor Miles and Leach, Mr Jonathan
Authors: Dada, A. C., Leach, J., Buller, G. S., Padgett, M. J., and Andersson, E.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Nature Physics
Publisher:Nature Publishing Group
ISSN:1745-2473
ISSN (Online):1745-2481
Published Online:08 May 2011

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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