Quantum correlations in quantum emitters strongly coupled with metallic nanoparticles

We study the dynamics of two initially entangled qubits prepared in an extended Werner-like state, where each one interacts locally with a spherical metallic nanoparticle. We combine quantum dynamics beyond the rotating-wave approximation with classical electromagnetic calculations in order to compute the time evolution of quantum discord and entanglement using entanglement of formation. We present results for qubits either quantum dots or J-aggregates and compare the evolution of quantum discord and entanglement of formation. We find interesting phenomena such as entanglement sudden death, periodic entanglement revival, entanglement oscillations and entanglement trapping by varying the initial state or the distance of each qubit to the corresponding nanoparticle.