title: Generalised monogamy relation of convex-roof extended negativity in multi-level systems.
abstract: In this paper, we investigate the generalised monogamy inequalities of convex-roof extended negativity (CREN) in multi-level systems. The generalised monogamy inequalities provide the upper and lower bounds of bipartite entanglement, which are obtained by using CREN and the CREN of assistance (CRENOA). Furthermore, we show that the CREN of multi-qubit pure states satisfies some monogamy relations. Additionally, we test the generalised monogamy inequalities for qudits by considering the partially coherent superposition of a generalised W-class state in a vacuum and show that the generalised monogamy inequalities are satisfied in this case as well.
authors.affiliation: College of Computer Science, Shaanxi Normal University, Xi'an, 710062, China.
authors.forename: Tian
authors.initials: T
authors.lastname: Tian
authors.affiliation: College of Computer Science, Shaanxi Normal University, Xi'an, 710062, China.
authors.forename: Yu
authors.initials: Y
authors.lastname: Luo
authors.affiliation: College of Computer Science, Shaanxi Normal University, Xi'an, 710062, China.
authors.forename: Yongming
authors.initials: Y
authors.lastname: Li