Entanglement Distribution Revealed by Macroscopic Observations

Author(s)
Caslav Brukner, J Kofler
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 multipartite entanglement.

Organisation(s)
External organisation(s)
Österreichische Akademie der Wissenschaften (ÖAW)
Journal
Physical Review A
Volume
74
No. of pages
4
ISSN
1050-2947
DOI
https://doi.org/10.1103/PhysRevA.74.050304
Publication date
2006
Peer reviewed
Yes
Austrian Fields of Science 2012
103008 Experimental physics
Portal url
https://ucris.univie.ac.at/portal/en/publications/entanglement-distribution-revealed-by-macroscopic-observations(364e270c-698f-4ae5-a498-be123a656121).html