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Phys Rev Lett. 2009 Aug 21;103(8):083602. Epub 2009 Aug 20.

Holographic ghost imaging and the violation of a Bell inequality.

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Department of Physics and Astronomy, SUPA, University of Glasgow, Glasgow G12 8QQ, United Kingdom.


We demonstrate the contrast enhancement of images within a ghost-imaging system by use of nonlocal phase filters. We use parametric down-conversion as the two-photon light source and two separated phase modulators, in the signal and idler arms which represent different phase filters and objects, respectively. We obtain edge enhanced images as a direct consequence of the quantum correlations in the orbital angular momentum (OAM) of the down-converted photon pairs. For phase objects, with differently orientated edges, we show a violation of a Bell-type inequality for an OAM subspace, thereby unambiguously revealing the quantum nature of our ghost-imaging arrangement.

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