Imaging high-dimensional spatial entanglement with a camera.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 22871804.
- Also identified by DOI 10.1038/ncomms1988 and PMC identifier 3432466.
- Licence recorded as CC BY-NC-SA.
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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.