Entanglement generation among quantum dots and surface plasmons of a metallic nanoring

Qurban, Misbah; Ikram, Manzoor; Ge, Guo-Qin; Zubairy, M. Suhail

doi:10.1088/1361-6455/aacbfc

Cited by 11 publications

(12 citation statements)

References 45 publications

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“…where â1 (â † 1 ) and â2 (â † 2 ) are the annihilation (creation) operators for the collective plasmon excitations in the driven and the attached oscillators, corresponding to bright and dark modes. Since properties like entanglement [34][35][36] are not of interest, they will soon represent the amplitudes of the associated plasmon oscillations (â i → α i ) and the problem will be reduced to a classical problem. f is the coupling matrix element between the polarization field induced by â1 and â2 .…”

Section: Analytical Modelmentioning

confidence: 99%

Plasmon lifetime enhancement in a bright-dark mode coupled system

2020

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Metallic nanoparticles can localize the incident light to hotspots as plasmon oscillations, where the intensity can be increased up to four orders of magnitude. Even though the lifetime of plasmons are typically short, it can be increased via interactions with quantum emitters, e.g. spaser nanolasers. However, molecules can bleach in days. Here, we study the lifetime enhancement of plasmon excitations due to the coupling with longer lifetime dark plasmon modes. Exact solutions of the 3D Maxwell equations, i.e. FDTD, demonstrates that the lifetime of the coupled system increases, as also predicted by a basic oscillator model. We report an optimum bright-dark plasmon mode coupling, where lifetime enhancement becomes maximum, and show that no precise positioning of the nanostructures is required to obtain enhanced lifetime.

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Section: Analytical Modelmentioning

confidence: 99%

Plasmon lifetime enhancement in a bright-dark mode coupled system

2020

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“…We have shown earlier that the single excitation, i.e., both the QDs in ground states and a SP in clockwise mode generate entanglement between QDs as well as among SP modes at some particular values of interdot distance kd and interactional parameter µt. [43] Here we consider the initial state of the QD-SP system…”

Section: Entanglement Dynamicsmentioning

confidence: 99%

Plasmon mediated entanglement dynamics of distant quantum dots

et al. 2019

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We investigate the time evolution of entanglement between two quantum dots in an engineered vacuum environment such that a metallic nanoring having a surface plasmon is placed near the quantum dots. Such engineering in environment results in oscillations in entanglement dynamics of the quantum dots systems. With proper adjustment of the separation between the quantum dots, entanglement decay can be stabilized and preserved for longer time than its decay without the surface plasmons interactions.

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“…[42] It is considered one of the most promising candidates for realizing nonlinear interactions in solid-state quantum systems. [43,44] QD-cavity coupled system enables various quantum information processing tasks, including entanglement generation, [45,46] entanglement analysis, [47,48] entanglement swapping, [49,50] entanglement purification, [51,52] entanglement concentration, [35,53] quantum repeaters, [54,55] and quantum gates. [35,[56][57][58][59][60] An electron-system PCG was constructed in two optical microcavities.…”

Section: Introductionmentioning

confidence: 99%

A Two‐Step Entanglement Concentration for the Less‐Entangled Four‐Photon Cluster States

Yang,

Xiu,

et al. 2024

Adv Quantum Tech

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Entanglement concentration serves as an essential tool to obtain the maximally entangled states from the less‐entangled states in quantum information processing tasks. An efficient two‐step entanglement concentration protocol (ECP) is proposed to concentrate the less‐entangled four‐photon cluster states with four unknown coefficients into the maximally entangled states in this paper. The protocol utilizes parity‐check gate and photon‐polarized controlled‐Z gate, constructed with a single semiconductor quantum dot in a single optical microcavity (quantum dot‐cavity coupled system) and several linear optical elements. The discarded quantum states can be recycled in the next round concentration to achieve a higher success probability. Under conditions of strong coupling and weak side leakage rate, the ECP can tend toward ideal fidelity and efficiency. Compared to the previously proposed ECPs that utilize various auxiliary tools such as additional entangled states and complex quantum logic gates, the ECP significantly simplifies the analysis process and enables efficient implementation. Thus, the ECP is more economical and feasible in future optical systems.

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Entanglement generation among quantum dots and surface plasmons of a metallic nanoring

Cited by 11 publications

References 45 publications

Plasmon lifetime enhancement in a bright-dark mode coupled system

Plasmon lifetime enhancement in a bright-dark mode coupled system

Plasmon mediated entanglement dynamics of distant quantum dots

A Two‐Step Entanglement Concentration for the Less‐Entangled Four‐Photon Cluster States

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