A clever approach has been used to imprint a phase pattern on a laser beam. The pattern is not only random at each point, but also depends on information stored elsewhere in the pattern.
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Eichelkraut, T., Szameit, A. Random sudoku light. Nature 526, 643–644 (2015). https://doi.org/10.1038/526643a
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DOI: https://doi.org/10.1038/526643a
