Concurrence in collective models
Quantum Physics
2007-05-23 v3 Statistical Mechanics
Abstract
We review the entanglement properties in collective models and their relationship with quantum phase transitions. Focusing on the concurrence which characterizes the two-spin entanglement, we show that for first-order transition, this quantity is singular but continuous at the transition point, contrary to the common belief. We also propose a conjecture for the concurrence of arbitrary symmetric states which connects it with a recently proposed criterion for bipartite entanglement.
Cite
@article{arxiv.quant-ph/0603108,
title = {Concurrence in collective models},
author = {J. Vidal},
journal= {arXiv preprint arXiv:quant-ph/0603108},
year = {2007}
}
Comments
8 pages, 2 figures, published version