Imaging high-dimensional spatial entanglement with a camera

M.P. Edgar (), D.S. Tasca, F. Izdebski, R.E. Warburton, J. Leach, M. Agnew, G.S. Buller, R.W. Boyd and M.J. Padgett
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M.P. Edgar: SUPA, School of Physics and Astronomy, University of Glasgow
D.S. Tasca: SUPA, School of Physics and Astronomy, University of Glasgow
F. Izdebski: SUPA, School of Engineering and Physical Sciences, Heriot-Watt University
R.E. Warburton: SUPA, School of Engineering and Physical Sciences, Heriot-Watt University
J. Leach: University of Ottawa
M. Agnew: University of Ottawa
G.S. Buller: SUPA, School of Engineering and Physical Sciences, Heriot-Watt University
R.W. Boyd: University of Ottawa
M.J. Padgett: SUPA, School of Physics and Astronomy, University of Glasgow

Nature Communications, 2012, vol. 3, issue 1, 1-6

Abstract: Abstract 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.

Date: 2012
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DOI: 10.1038/ncomms1988

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