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Single plasmon router with two quantum dots side coupled to two plasmonic waveguides with a junction

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Abstract

We proposed a new multichannel scheme of quantum routing for single plasmons with two quantum dots (QDs) side coupled to two plasmonic waveguides, one of which is infinite and the other is semi-infinite, with a junction. We investigated theoretically the routing properties of the proposed system for the incident single plasmons, such as the transmission, reflection, and transfer rates via the real-space approach. Our results show that in such a coupled system, the incident single plasmons can be routed by controlling the parameters, such as the detuning, the atomic transition frequencies, the coupling strengths, and the spacing between QDs. In particular, we showed that the transfer rate of single plasmons could be greatly changed according to the position of the junction. Our multichannel scheme for routing of single plasmons could be utilized for realizing quantum devices, such as quantum switches, directional couplers, and quantum routers.

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Acknowledgements

This work was supported by the National Program on Key Science Research of Democratic People’s Republic of Korea (Grant No. 1-6-8).

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

    Nam-Chol Kim, Myong-Chol Ko, Ju-Song Ryom, Hyok Choe, Il-Hyang Choe, Su-Ryon Ri & Song-Gun Kim

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  1. Nam-Chol Kim
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Correspondence to Nam-Chol Kim.

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Kim, NC., Ko, MC., Ryom, JS. et al. Single plasmon router with two quantum dots side coupled to two plasmonic waveguides with a junction. Quantum Inf Process 20, 5 (2021). https://doi.org/10.1007/s11128-020-02884-2

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