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://ucrisportal.univie.ac.at/en/publications/364e270c-698f-4ae5-a498-be123a656121