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.

中文翻译：

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非Hermitian量子系统中经典驱动场的主动控制双频单向无反射

我们提出了一种方案，该方案通过在非Hermitian量子系统中由经典驱动场实现在例外点处的主动控制双波段单向无反射性，该系统由两个Λ型三能级量子点侧耦合到等离激元波导组成。我们证明，可以通过适当地调整经典驱动场，两个量子点之间的相移，两个量子点的耗散以及量子点-波导耦合强度，来控制双波段单向无反射。此外，可以分别在正向和反向获得质量因子约为375.40和402.59的双波段单向无反射光谱。