Imaging high-dimensional spatial entanglement with a camera

The light produced by parametric down-conversion shows strong spatial entanglement that leads to violations of EPR criteria for separability. Historically, such studies have been performed by scanning a single-element, single-photon detector across a detection plane. Here we show that modern electro...

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Published inNature communications Vol. 3; no. 1; p. 984
Main Authors Edgar, M P, Tasca, D S, Izdebski, F, Warburton, R E, Leach, J, Agnew, M, Buller, G S, Boyd, R W, Padgett, M J
Format Journal Article
LanguageEnglish
Published England Nature Publishing Group 2012
Nature Pub. Group
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Summary:The light produced by parametric down-conversion shows strong spatial entanglement that leads to violations of EPR criteria for separability. Historically, such studies have been performed by scanning a single-element, single-photon detector across a detection plane. Here we show that modern electron-multiplying charge-coupled device cameras can measure correlations in both position and momentum across a multi-pixel field of view. This capability allows us to observe entanglement of around 2,500 spatial states and demonstrate Einstein-Podolsky-Rosen type correlations by more than two orders of magnitude. More generally, our work shows that cameras can lead to important new capabilities in quantum optics and quantum information science.
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ISSN:2041-1723
2041-1723
DOI:10.1038/ncomms1988