Quantum instability and edge entanglement in a quasi-long-range order
Quantum Physics
2009-11-13 v2
Abstract
We investigate the build-up of quasi-long-range order in the XX chain with transverse magnetic field at finite size. As the field is varied, the ground state of the system displays multiple level crossings producing a sequence of entanglement jumps. Using the partial fidelity and susceptibility, we study the transition to the thermodynamic limit and argue that the topological order can be described in terms of kink-antikink pairs and marked by edge spin entanglement.
Cite
@article{arxiv.0807.1602,
title = {Quantum instability and edge entanglement in a quasi-long-range order},
author = {Wonmin Son and Luigi Amico and Francesco Plastina and Vlatko Vedral},
journal= {arXiv preprint arXiv:0807.1602},
year = {2009}
}
Comments
5pages and 6 figures