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International Journal of Modern Physics B

Entanglement created in three-quantum dot system coupled to plasmonic waveguide

Ju-Song Ryom, Myong-Chol Ko, Nam-Chol Kim, Gwang-Il Kim, Song-Il Choe, Son-Gyong Kim

Published Aug 10, 2020• 4 citations
Publisher

Abstract

We investigate the entanglement properties of three-quantum dot (QD) system coupled to surface plasmonic waveguide by means of the concurrence with fully quantum-mechanical approach. High bipartite entanglement of three QDs could be achieved by adjusting the interparticle distance of the QDs, the detuning and the QD-waveguide coupling strength. We show that the bipartite entanglement of three-QD system is higher and its switching effect is better than the case of two-QD system. The discussed system with three QDs provides us rich way to realize the quantum entanglement used in the quantum information processing such as quantum computation and quantum communication.

DOI
10.1142/s0217979220501908

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We investigate the quantum entanglement between two quantum dots (QDs) in a plasmonic waveguide with a near-zero mode index, considering the dependence of concurrence on interdot distance, QD waveguide frequency detuning, and coupling strength ratio. High concurrence is achieved for a wide range of interdot distances due to the near-zero mode index, which largely relaxes the strict requirement of interdot distance in conventional dielectric waveguides or metal nanowires. The proposed QD waveguide system with near-zero phase variation along the waveguide near the mode cutoff frequency shows very promising potential in quantum optics and quantum information processing.
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We study the systems of two and three quantum dots positioned near a metallic nanoring having a surface plasmon in a particular mode. Interaction of surface plasmon with quantum dots generates entanglement between quantum dots as well as among the incident and reflected modes of the surface plasmons. We show that the maximum amount of entanglement is generated among two initially unentangled quantum dots separated by distance and with interaction parameter , while entanglement among two counter-propagating modes of the surface plasmons can be generated with interdot distance and interaction parameter , where k and μ are the propagation vector and coupling constant, respectively. In case of three quantum dots, the maximum entanglement among the quantum dots is obtained at kd = mπ /3 and Finally, the scheme is straightforwardly generalized to generate quantum entanglement among N quantum dots as well as among two counter-propagating modes of the surface plasmon due to their interactions with quantum dots.
Abstract A single photon router with a desired high routing rate is of great importance for quantum networks. Recently, coupling between channeled plasmons and quantum emitters have been widely used to explore the routing feasibility in hybrid systems. As a capable alternative, we suggested a scheme of a single plasmon router using a V-type three-level quantum dot (QD) sandwiched between two plasmonic waveguides. We theoretically investigated the transmission and transfer rates of single plasmons in the complex system via the real-space approach. Our calculations show that the single plasmons from the incident route could be redirected by controlling such parameters as the intensity of the classical field, the detunings and the couplings between the QD and the plasmonic waveguides. Our proposed scheme could be used not only for the design of a single plasmon router but also for the design of quantum switches and quantum couplers in quantum photonic integrated circuits.