Dual-band unidirectional reflectionlessness in non-Hermitian quantum system consisting of a gain and a loss plasmonic cavities

Dual-band unidirectional reflectionlessness is investigated in a non-Hermitian quantum system that consists of two plasmonic cavities coupled to a one-dimensional plasmonic waveguide. By appropriately adjusting the phase shift and decay rate of two plasmonic cavities, dual-band unidirectional reflectionlessness is obtained at exceptional points. Moreover, the dual-band unidirectional reflectionlessness can be manipulated in the wide ranges of phase shift and decay rate. In addition, high non-reciprocal entanglement between two plasmonic cavities can be obtained under appropriate phase shift and decay rate of two plasmonic cavities.