2012/04/30 by Matthew P. Edgar, Daniel S. Tasca, Frauke Izdebski +6 · 1 citation
Physics and Astronomy · #quant-ph #physics.optics
paper · pdf · doi:10.1038/ncomms1988
published as Nat. Commun. 3:984 (2012) · 5 pages, 4 figures
arxiv created 2012/08/09 · arxiv updated 2012/08/10
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.