Operational Interpretation for Global Multipartite Entanglement
Abstract
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.
- Publication:
-
Physical Review Letters
- Pub Date:
- March 2008
- DOI:
- 10.1103/PhysRevLett.100.100503
- arXiv:
- arXiv:0706.2019
- Bibcode:
- 2008PhRvL.100j0503B
- Keywords:
-
- 03.67.Mn;
- 03.65.Ta;
- 03.65.Ud;
- Entanglement production characterization and manipulation;
- Foundations of quantum mechanics;
- measurement theory;
- Entanglement and quantum nonlocality;
- Quantum Physics
- E-Print:
- 4 pages, 1 figure