Entanglement distribution revealed by macroscopic observations

Details Entanglement distribution revealed by macroscopic observations Entanglement distribution revealed by macroscopic observations

2006-03-23

arxiv.org/abs/quant-ph/0603208v2

Phys. Rev. A 74, 050304(R) (2006)

Physics

Quantum Physics

4 pages, 2 figures, revised and published version

Scientific paper

10.1103/PhysRevA.74.050304

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.

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