title: Imaging high-dimensional spatial entanglement with a camera.
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.
authors.affiliation: SUPA, School of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, UK. matthew.edgar@glasgow.ac.uk
authors.forename: M P
authors.initials: MP
authors.lastname: Edgar
authors.forename: D S
authors.initials: DS
authors.lastname: Tasca
authors.forename: F
authors.initials: F
authors.lastname: Izdebski
authors.forename: R E
authors.initials: RE
authors.lastname: Warburton
authors.forename: J
authors.initials: J
authors.lastname: Leach
authors.forename: M
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authors.lastname: Agnew
authors.forename: G S
authors.initials: GS
authors.lastname: Buller
authors.forename: R W
authors.initials: RW
authors.lastname: Boyd
authors.forename: M J
authors.initials: MJ
authors.lastname: Padgett