Entanglement Generated in Quantum Dot-Cavity Coupled System Mediated by Plasmonic Waveguide

Abstract

We theoretically study the entanglement between two quantum dots (QDs) with dipole–dipole interaction (DDI) in the composite quantum system composed of a plasmonic waveguide and two cavities. The analytical expressions of the pairwise concurrence as a measure of entanglement are obtained by determining the excitation probability amplitudes with real space formalism. The properties of the entanglement are discussed in detail under the control of physical parameters such as detuning and coupling strengths. We demonstrate the DDI can improve the entanglement in short distance and highly entangled states can be obtained in the cases of symmetric and asymmetric coupling.