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Single plasmon routing with the four quantum dots coupled to a cross-type plasmonic waveguide

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Abstract

We proposed a new scheme of multichannel quantum routing for single plasmons (SPs) using the cross-type plasmonic waveguides (PWs) that couples to four two-level InGaAs quantum dots (QDs). In our proposed system, each of two PWs in cross type can be infinite silver nanowire. We theoretically studied the routing properties of the proposed system for the incident SPs by using the real-space formalism. Our results show that in such a coupled system, the routing of incident SPs can be achieved depending on several physical parameters, such as the detuning of the transition frequencies of QDs from the frequency of propagating SPs, the coupling strengths of the QDs to PWs and the separation distance between the QDs. It is shown that the transmission of SPs can be switched on or off by adjusting the separation distance between the QDs, which could be exploited to probe the spacing between the QDs. It is also shown that the transfer rate of SPs can be switchable and redirected by appropriately adjusting the QDs’ separation distance and coupling strengths, which is a prerequisite for quantum routers. Our multichannel scheme for the routing of the SPs could be utilized for making quantum devices realizable, such as quantum routers, quantum filters, directional couplers and quantum switches.

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All data and material considered in this paper are transparent.

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The authors have used Mathematica10.0 as software applications.

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Acknowledgements

This work was supported by the National Program on Key Science Research of Democratic People’s Republic of Korea.

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Authors and Affiliations

  1. Faculty of Physics, Kim Il Sung University, Pyongyang, Democratic People’s Republic of Korea

    Chol-Min Kim, Nam-Chol Kim, Myong-Chol Ko & Ju-Song Ryom

  2. Faculty of Information Science, University of Sciences, Pyongyang, Democratic People’s Republic of Korea

    Hyok-Chol Choe

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Contributions

N-CK is the project manager. He designed the model and checked the accuracy of calculations. C-MK conceived the idea and performed the theoretical and numerical calculations. He also analyzed the results and contributed to preparation of the manuscript. M-CK and Z-SR checked the correctness of the calculations and contributed to preparation of the manuscript. H-CC contributed to preparation of the manuscript.

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Correspondence to Nam-Chol Kim.

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Kim, CM., Kim, NC., Ko, MC. et al. Single plasmon routing with the four quantum dots coupled to a cross-type plasmonic waveguide. Quantum Inf Process 22, 226 (2023). https://doi.org/10.1007/s11128-023-03976-5

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