Phys. Rev. Lett. 100, 100503 (2008) [4 pages]Operational Interpretation for Global Multipartite EntanglementReceived 27 June 2007; published 14 March 2008 We introduce an operational interpretation for pure-state global multipartite entanglement based on quantum estimation. We show that the estimation of the strength of low-noise locally depolarizing channels, as quantified by the regularized quantum Fisher information, is directly related to the Meyer-Wallach multipartite entanglement measure. Using channels that depolarize across different partitions, we obtain related multipartite entanglement measures. We show that this measure is the sum of expectation values of local observables on two copies of the state. © 2008 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.100.100503
DOI:
10.1103/PhysRevLett.100.100503
PACS:
03.67.Mn, 03.65.Ta, 03.65.Ud
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