Journal
PHYSICAL REVIEW LETTERS
Volume 113, Issue 10, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.113.100503
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Funding
- RGC of Hong Kong [HKU7058/11P, HKU7045/13P]
- NSF-China [10905016]
- Hebei NSF [A2012205062]
- fund of Hebei Normal University
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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 indicators: 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.
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