Mutual information in coupled double quantum dots

Coupled bistate multipartite systems are extensively studied as a versatile model in the field of information thermodynamics. As such systems are functionalized via the interaction among the particles, mutual information is a key property in their operation. In this study, we analyze a simple numerical model comprising a set of coupled double quantum dots, where the disconnection of the elements is represented by the removal of Coulomb interaction between the quantum dots. We calculate the mutual information in the model system, as the Kullback–Leibler divergence between the connected and disconnected status, through the probability distribution of the electronic states from the master transition-rate equations. We reasonably demonstrate that the increase in the strength of interaction between the quantum dots leads to higher mutual information, owing to the larger divergence in the probability distributions of the electronic states. Our numerical model could be a useful basic tool for the investigations of information-driven systems. (paper)