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Multiport quantum routing with four quantum dots placed at the junctions of ladder-type plasmonic waveguide

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Abstract

We have proposed a new multichannel scheme of multiport quantum routing for single plasmons (SPs) with four quantum dots placed at the junctions of ladder-type plasmonic waveguides (PWs), two of which are infinite and the others are the finite silver nanowires. We investigated theoretically the routing properties of the proposed system for the incident SPs via the real-space approach. Our results show that in such a coupled system, the incident SPs can be routed by controlling the parameters, such as the detuning between the incident frequency of SPs and the transition frequencies of QDs, the coupling strengths between the QDs and PWs, and the spacing between QDs. We found that a complete transfer rate and half-transfer rates as well as quarter-output for each port could be realized by suitable adjusting the parameters. Our multichannel scheme for routing of SPs could be utilized for realizing quantum devices, such as quantum routers, quantum switches, quantum beam splitters and quantum directional couplers.

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Data availability

All data and material considered in this paper are transparent.

Code availability

Authors have used Mathematica10.0 as software applications.

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Acknowledgments

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

    Nam-Chol Kim, Chol-Min Kim, Myong-Chol Ko, Ju-Song Ryom, Gang-Yong Ri & Gwang-Myong Ryom

  2. Faculty of Mathematics, Kim Il Sung University, Pyongyang, Democratic People’s Republic of Korea

    Yong-Jin Kim

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  1. Nam-Chol Kim
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  2. Chol-Min Kim
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Contributions

NCK is the project manager. He designed the model and checked the accuracy of calculations. CMK conceived the idea and performed the theoretical and numerical calculations. He also analyzed the results and contributed to preparation of the manuscript. MCK and JSR checked the correctness of the calculations and contributed to preparation of the manuscript. GYR, GMR and YJK contributed to preparation of the manuscript.

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Correspondence to Nam-Chol Kim.

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Kim, NC., Kim, CM., Ko, MC. et al. Multiport quantum routing with four quantum dots placed at the junctions of ladder-type plasmonic waveguide. Quantum Inf Process 22, 21 (2023). https://doi.org/10.1007/s11128-022-03722-3

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