2014/01/31 by Yan-Kui Bai, Yuan-Fei Xu, Z. D. Wang · 2 citations
Physics and Astronomy · #quant-ph
paper · pdf · doi:10.1103/physrevlett.113.100503
published as Phys. Rev. Lett. 113, 100503 (2014) · 4.5 pages, 2 figures plus the supplemental material
arxiv created 2014/09/07 · arxiv updated 2014/09/10
We prove exactly that the squared entanglement of formation, which quantifies the bipartite entanglement, obeys a general monogamy inequality in an arbitrary multiqubit mixed state. Based on this kind of exotic monogamy relation, we are able to construct two sets of useful entanglement indicator: the first one can detect all genuine multiqubit entangled states even in the case of the two-qubit concurrence and n-tangles being zero, while the second one can be calculated via quantum discord and applied to multipartite entanglement dynamics. Moreover, we give a computable and nontrivial lower bound for multiqubit entanglement of formation.