Optical loss degrades quantum correlations, hindering the use of quantum quadrature entanglement for many applications. Researchers have now experimentally demonstrated that this entanglement can be recovered using photon subtraction.
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Ourjoumtsev, A. Repairing quadrature entanglement. Nature Photon 4, 136–138 (2010). https://doi.org/10.1038/nphoton.2010.12
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DOI: https://doi.org/10.1038/nphoton.2010.12