Quantum discord modulated by detuning in a plasmonic nanosystem
Fan Zhang, Dongxing Zhao, Xueyuan Hu, Qihuang Gong, Ying Gu · Journal of Physics B Atomic Molecular and Optical Physics · 2019
Abstract We demonstrate the impact of detunings on quantum discord between two qubits in a hybrid system composed of two quantum emitters (QEs) and a resonant Ag nanoparticle (AgNP). The dynamics and steady-state quantum discord in weak- and strong-driving regimes are both investigated. In these regimes, the existence of detunings between QEs can enhance quantum discord because of the superposition of entangled states. By the aid of the strong localized field of the AgNP, quantum discord of two QEs is effectively improved. Our protocol aims to not only complete the dynamics model of cavity-based quantum discord, but also pave a way to on-chip quantum information devices.