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Parity-time ($\mathcal{PT}$) symmetry, originally conceived for non-Hermitian open quantum systems, has opened an excitingly new avenue for the coherent control of light.
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The 𝒞 𝒫 𝒯 \mathcal{CPT} symmetris here are all classical and should not be confued with those in quantum field theory, in which 𝒞 \mathcal{C} is always respected by electromagnetism. See references, e.g., M. E. Peskin, D. V. Schroeder, An Introduction to Quantum Field Theory, Addison Wesley (1997)
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