Holographic ghost imaging and the violation of a bell inequality

B. Jack, J. Leach, J. Romero, S. Franke-Arnold, M. Ritsch-Marte, S.M. Barnett, M.J. Padgett

Research output: Contribution to journalArticlepeer-review

155 Citations (Scopus)


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.
Original languageEnglish
Pages (from-to)083602-1-083602-4
JournalPhysical Review Letters
Issue number8
Publication statusPublished - 21 Aug 2009


  • holographic ghost imaging
  • bell inequality
  • phase filters


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