Journal
PHYSICAL REVIEW LETTERS
Volume 103, Issue 8, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.103.083602
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Funding
- U.K. EPSRC
- European Commission [FP7-ICT-221906]
- SUPA
- EPSRC [EP/G011567/1, EP/G011656/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/G011656/1, EP/G011567/1] Funding Source: researchfish
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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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