We propose a scheme to realize the active controlled dual-band unidirectional reflectionlessness at exceptional points by classical driving field in a non-Hermitian quantum system that consists of two Λ-type three-level quantum dots side coupled to a plasmonic waveguide. We demonstrate that the dual-band unidirectional reflectionlessness can be controlled by appropriately tuning classical driving field, phase shift between two quantum dots, dissipations of two quantum dots, and quantum dot-waveguide coupling strengths. Furthermore, the dual-band unidirectional reflectionlessness spectra with quality factors of ∼375.40 and ∼402.59 can be obtained in the forward and backward directions, respectively.

Dual-frequency unidirectional reflectionlessness is investigated in a quantum system consisting of a two-level and a V-type three-level quantum dots coupled to a plasmonic waveguide based on electromagnetically induced transparency-like effect. The results show that the dual-frequency unidirectional reflectionlessness can be obtained by appropriately adjusting the phase shift between two quantum dots, decay rates of quantum dots, and coupling strengths between quantum dots and plasmonic waveguide. Moreover, the dual-frequency low unidirectional reflection can be manipulated in the wide ranges of decay rates and coupling strengths.