Origins and optimization of entanglement in plasmonically coupled quantum dots

Abstract

A system of two or more quantum dots interacting with a dissipative plasmonic nanostructure is investigated in detail by using a cavity quantum electrodynamics approach with a model Hamiltonian. We focus on determining and understanding system configurations that generate multiple bipartite quantum entanglements between the occupation states of the quantum dots. These configurations include allowing for the quantum dots to be asymmetrically coupled to the plasmonic system. Analytical solution of a simplified limit for an arbitrary number of quantum dots and numerical simulations and optimization for the two- and three-dot cases are used to develop guidelines for maximizing the bipartite entanglements. For any number of quantum dots, we show that through simple starting states and parameter guidelines, one quantum dot can be made to share a strong amount of bipartite entanglement with all other quantum dots in the system, while entangling all other pairs to a lesser degree.

arXiv comment34 pages, 7 figures

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• PsiQuaSP -- A library for efficient computation of symmetric open quantum systems
• Higher-Order Photon Statistics as a New Tool to Reveal Hidden Excited States in a Plasmonic Cavity
• All-optical Nanoscale Control of Photon Correlations: Dressed States Assisted Quantum Interference Effects
• Ground-state cooling enabled by critical coupling and dark entangled states
• Optical Detection and Storage of Entanglement in Plasmonically Coupled Quantum Dot Qubits
• Entangled Photon Resonance Energy Transfer in Arbitrary Media
• Description of spontaneous photon emission and local density of states in presence of a lossy polaritonic inhomogenous medium
• Brachistochrone of Entanglement for Spin Chains
• Coherent photon coincidence spectroscopy of single quantum systems
• Quantum dynamics of open many-qubit systems strongly coupled to a quantized electromagnetic field in dissipative cavities
• Generation of maximally entangled states in hybrid two quantum dots mediated by a spherical metal nanoparticle driven by external laser field