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. 2018 May 4;7:18009. doi: 10.1038/lsa.2018.9

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(a) Typical intensity images acquired by a CCD camera to determine the degree of entanglement E in the case of a scalar beam. The corresponding intensities I_uv with u,v∈{1, 2, 3}, arranged according to Table 1 for the cases of a (b) scalar, (c) semi-vector and (d) vector beams, with corresponding values of E=0.01, 0.32, 0.94.