Entanglement distribution revealed by macroscopic observations
量子物理
2007-05-23 v2
摘要
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.
引用
@article{arxiv.quant-ph/0603208,
title = {Entanglement distribution revealed by macroscopic observations},
author = {Johannes Kofler and Caslav Brukner},
journal= {arXiv preprint arXiv:quant-ph/0603208},
year = {2007}
}
备注
4 pages, 2 figures, revised and published version