Quantum routing of single plasmons with three quantum dots embedded in the triangular closed-loop type plasmonic waveguide

We have theoretically investigated the routing properties of single plasmons (SPs) by two-level quantum dots (QDs) embedded in triangular closed-loop type plasmonic waveguides (PWs) on the basis of the real-space approach. In our proposed hybrid system, three PWs are semi-infinite and the other PW is finite. Our results reveal that in such a hybrid system, the routing properties of SPs depend very sensitively on the manipulation of various parameters, such as the inter-QD distances, the detuning, and the coupling strength between the QDs and the PWs. In particular, we show that our hybrid system enables the transport of SPs from one channel to a purposed channel, the perfect routing, and the selective photon divisions. The proposed model for the routing of SPs can be used to develop essential quantum devices for the realization of quantum information processing, such as quantum networks, quantum routings, and quantum beam splitters.