The mathematical concept of parity'time symmetry, which was first introduced in field theories of quantum mechanics, has been demonstrated experimentally in a large-scale optical system. See Article p.167
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Razzari, L., Morandotti, R. Gain and loss mixed in the same cauldron. Nature 488, 163–164 (2012). https://doi.org/10.1038/488163a
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DOI: https://doi.org/10.1038/488163a
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