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Entanglement of two quantum dots with dipole–dipole interaction coupled to a cavity in plasmonic waveguide system

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Abstract

We investigate quantum entanglement between two quantum dots (QDs) with dipole–dipole interaction (DDI) in plasmonic waveguide system where a cavity is coupled to the QDs but decoupled from the waveguide. The real-space Hamiltonian and the concurrence are used in describing the composite quantum system and quantifying the entanglement, respectively. We analyze the influence of DDI on the entanglement and propose several effective schemes to achieve high entanglement by modulating the incident frequency, the resonant frequency of the cavity, the QD-cavity coupling strength and so on. Moreover, we demonstrate that coupling between the QDs and the cavity can enhance the entanglement of two QDs.

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All data and material considered in this paper are transparent.

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Authors have used Mathematica10.0 as software application.

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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

    Ju-Song Ryom, Gang-Yong Ri, Nam-Chol Kim, Myong-Chol Ko, Su-Ryon Ri & Song-Il Choe

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  1. Ju-Song Ryom
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  2. Gang-Yong Ri
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  3. Nam-Chol Kim
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  4. Myong-Chol Ko
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  5. Su-Ryon Ri
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  6. Song-Il Choe
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Contributions

N-CK supervised the project. He conceived the idea and performed theoretical calculations. J-SR performed theoretical and numerical calculations. He also analyzed the results obtained. M-CK and G-YR checked the correctness of the calculations and contributed to preparation of the manuscript. S-RR and S-IC contributed to the preparation of the manuscript.

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Correspondence to Nam-Chol Kim.

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Ryom, JS., Ri, GY., Kim, NC. et al. Entanglement of two quantum dots with dipole–dipole interaction coupled to a cavity in plasmonic waveguide system. Quantum Inf Process 22, 293 (2023). https://doi.org/10.1007/s11128-023-04019-9

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