Exploiting the spatial shapes of 'twisted' photons makes it possible to enhance the bit rate of free-space optical communications without requiring more bandwidth.
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Torres, J. Multiplexing twisted light. Nature Photon 6, 420–422 (2012). https://doi.org/10.1038/nphoton.2012.154
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DOI: https://doi.org/10.1038/nphoton.2012.154
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