Relations between the quantum correlation entropy and quantum discord for X-states in multipartite systems
Department of Mathematics, South China University of Technology, 510640, Guangzhou, People’s Republic of China
2 Laboratory of Quantum Science and Engineering, South China University of Technology, 510641, Guangzhou, People’s Republic of China
Accepted: 16 May 2022
Published online: 25 May 2022
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.
© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2022