Relations between the quantum correlation entropy and quantum discord for X-states in multipartite systems

Observational entropy is a generalization of Boltzmann entropy to quantum mechanics. Observational entropy based on coarse-grained measurements has a certain relations with other quantum information measures. Quantum correlation entropy and quantum discord are both physical quantities used to measure quantum correlation. The former is based on local observational entropy. The latter is based on von Neumann projection measurements acting on some subsystems. We study the relations between quantum correlation entropy and quantum discord for N-partite X-states with 4-dimensional subsystems.

Automated summary

Observational entropy is a generalization of Boltzmann entropy to quantum mechanics and is related to other quantum information measures. Quantum correlation entropy and quantum discord are physical quantities used to measure quantum correlation, based on different observational methods.