Nature Photonics spoke to Demetrios Christodoulides, of CREOL, The College of Optics & Photonics, University of Central Florida, about the birth of the parity–time-symmetry concepts in optics and the challenges and prospects on the path ahead.
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Pile, I.F.P. Gaining with loss. Nature Photon 11, 742–743 (2017). https://doi.org/10.1038/s41566-017-0060-9
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DOI: https://doi.org/10.1038/s41566-017-0060-9
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