Polygamy Inequalities for Qubit Systems

Entanglement polygamy, like entanglement monogamy, is a fundamental property of multipartite quantum states. We investigate the polygamy relations related to the concurrence C and the entanglement of formation E for general n-qubit states. We extend the results in [Phys. Rev. A 90, 024304 (2014)] from the parameter region α ≤ 0 to α ≤ α ₀, where 0 < α ₀ ≤ 2 for C, and 0<α ₀≤ √ {2} for E.