Multipartite Entanglement in Non-Equilibrium Quantum Phase Transition in a Collective Atomic System
Quantum Physics
2008-03-12 v1
Abstract
We study multipartite entanglement in non-equilibrium quantum phase transition (NEQPT) attainable in a coherently driven atomic ensemble undergoing collective decay. The NEQPT arises in the steady state of the system as the drive field strength is varied in comparison with the decay parameter. A close connection is observed between the critical behavior and the multi-partite entanglement in the system determined via the von Neumann entropy. The derivative of the von Neumann entropy shows Lambda-type behavior typical of the second order phase transitions. We further show that the calculated bi- and tri- partite entropies satisfy the Lieb inequality.
Cite
@article{arxiv.0803.1499,
title = {Multipartite Entanglement in Non-Equilibrium Quantum Phase Transition in a Collective Atomic System},
author = {Kishore T. Kapale and Girish S. Agarwal},
journal= {arXiv preprint arXiv:0803.1499},
year = {2008}
}
Comments
4 pages, 7 figures