Entanglement distribution revealed by macroscopic observations
arXiv:quant-ph/0603208 · doi:10.1103/PhysRevA.74.050304
Abstract
What can we learn about entanglement between individual particles in macroscopic samples by observing only the collective properties of the ensembles? Using only a few experimentally feasible collective properties, we establish an entanglement measure between two samples of spin-1/2 particles (as representatives of two-dimensional quantum systems). This is a tight lower bound for the average entanglement between all pairs of spins in general and is equal to the average entanglement for a certain class of systems. We compute the entanglement measures for explicit examples and show how to generalize the method to more than two samples and multi-partite entanglement.
4 pages, 2 figures, revised and published version
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