Odd-Time Reversal PT Symmetry Induced by an Anti-PT-Symmetric Medium.

  title={Odd-Time Reversal PT Symmetry Induced by an Anti-PT-Symmetric Medium.},
  author={Vladimir V. Konotop and Dmitry A. Zezyulin},
  journal={Physical review letters},
  volume={120 12},
We introduce an optical system (a coupler) obeying parity-time (PT) symmetry with odd-time reversal, T^{2}=-1. It is implemented with two birefringent waveguides embedded in an anti-PT-symmetric medium. The system possesses properties that are untypical for most physical systems with the conventional even-time reversal. Having a symmetry-protected degeneracy of the linear modes, the coupler allows for the realization of a coherent switch operating with a superposition of binary states that are… 

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