Tunable routing properties of single photon interacting with two quantum dots in a quantum router with the工-type coupled cavity waveguide system

Myong-Chol Ko (), Sung-Jin Kim, Nam-Chol Kim (), Su-Ryon Ri, Ju-Song Ryom, Kang-Sa Yun and Chung-Song Jo
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Myong-Chol Ko: University of Science and Technology Beijing
Sung-Jin Kim: University of Science and Technology Beijing
Nam-Chol Kim: Kim Il Sung University
Su-Ryon Ri: Kim Il Sung University
Ju-Song Ryom: Kim Il Sung University
Kang-Sa Yun: Kim Chaek University of Technology
Chung-Song Jo: Kim Il Sung University

The European Physical Journal B: Condensed Matter and Complex Systems, 2025, vol. 98, issue 8, 1-9

Abstract: Abstract A theoretical model of 工-shaped coupled-cavity waveguide with two quantum dots is proposed to realize the single photon router, where the two quantum dots are embedded in two nodes of two infinite coupled-cavity and a finite coupled-cavity waveguide respectively. Based on the discrete scattering equations, the routing properties such as transmission, reflection, and the transfer rate of the incident single photons are theoretically investigated. It is found that they can be controlled by various parameters such as the coupling strength between two quantum dots and three coupled-cavity waveguides, the transition energies of two quantum dots, wave vector, and the energy of the incident single photons, etc. Especially, when $$\omega_{e}^{(1)} = \omega_{e}^{(2)} = 10$$ ω e ( 1 ) = ω e ( 2 ) = 10 , in case of $$k = 2n{\pi \mathord{\left/ {\vphantom {\pi 4}} \right. \kern-0pt} 4}\,(n = 1,2,...)$$ k = 2 n π π 4 4 ( n = 1 , 2 , . . . ) ,the incident single photons have two symmetric peaks with relative to the resonant energy, but in case of $$k = (2n + 1){\pi \mathord{\left/ {\vphantom {\pi 4}} \right. \kern-0pt} 4}\,(n = 0,1,2,...)$$ k = ( 2 n + 1 ) π π 4 4 ( n = 0 , 1 , 2 , . . . ) , there appears only one transfer peak with blue or red shift due to the quantum interference between the two quantum dots. The tunable routing properties of the single photons in the 工-shape quantum router might have potential applications for future quantum devices. Graphical abstract

Date: 2025
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DOI: 10.1140/epjb/s10051-025-01017-x

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