Matthew P. Edgar, Daniel S. Tasca, Frauke Izdebski, Ryan E. Warburton, Jonathan Leach, Megan Agnew, Gerald S. Buller, Robert W. Boyd, Miles J. Padgett
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 CCD 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 2500 spatial states and demonstrate EPR-type correlations by more than two orders of magnitude. More generally, our work shows that such cameras can lead to important new capabilities in quantum optics and quantum information science.
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http://arxiv.org/abs/1204.1293
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