On the propagation of quantum correlations in a cavity quantum electrodynamics network

In this paper we present the analysis of a quantum direct communication protocol. Based on the propagation of quantum correlations, we analyze a model of two chains of atoms inside cavities, joined by optical fibers, which can be used as a quantum communication protocol. We study the dynamics of the entanglement and the quantum discord, using the generalized master equation. We first study the free evolution of the quantum correlations through the cavity network and compare it with the case where an eavesdropper has performed a measurement on one of the cavities. We also find the quantum discord to be a more robust measure of the quantum correlations and study the optimal initial condition to detect the eavesdropper.