Quantum Routing for Single Plasmons Modulated by the Dipole–Dipole Interaction in a π-Shaped Channel

• Published in: Journal of low temperature physics 2022-04, Vol.207 (1-2), p.58-70
• Main Authors: Kim, Song-Gun, Kim, Nam-Chol, Ko, Myong-Chol, Ryom, Ju-Song, Choe, Il-Hyang, Choe, Song-Il, Kim, Yong-Jin
• Format: Article
• Language: English
• Subjects: Characterization and Evaluation of Materials; Condensed Matter Physics; Dipole interactions; Directional couplers; Hybrid systems; Low temperature physics; Magnetic Materials; Magnetism; Physics; Physics and Astronomy; Plasmons; Quantum dots; Routers; Switches; Waveguides
• ISSN: 0022-2291; 1573-7357
• DOI: 10.1007/s10909-022-02698-9

We theoretically investigate a new scheme of single plasmon (SP) quantum router with a π-shaped channel consisting of two quantum dots (QDs) and three plasmonic waveguides (PWs), where the two QDs are coupled to the junctions where the infinite PW is junctioned to the other two semi-infinite PWs. Based on the real-space approach, we show that the proposed hybrid system can operate as a SP router. Our results show that SPs can be routed from one channel to the other channels by adjusting such parameters as the detuning, the distance between the QDs and the coupling strengths between the QDs and the PWs. We also show that the dipole–dipole interaction (DDI) between the QDs influences greatly both the position and height of the scattering peaks. Based on the obtained characteristics, the proposed scheme could be utilized for designing and realizing quantum devices, such as quantum switches, directional couplers and multiport quantum routers.