System model (IMAGE)

Science China Press

System model

Caption

The upper panel shows two coupled resonators. The left resonator (red) has nonlinear saturable gain, and the other resonator (blue) has linear loss. Such a nonlinear non-Hermitian system can be mapped into a PT symmetric three-resonator system as shown in the lower panel with linear gain (G), neutral (N) and loss (L) resonators.

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