Spin Squeezing, Negative Correlations, and Concurrence in the Quantum Kicked Top Model
Quantum Physics
2010-11-16 v1
Abstract
We study spin squeezing, negative correlations, and concurrence in the quantum kicked top model. We prove that the spin squeezing and negative correlations are equivalent for spin systems with only symmetric Dicke states populated. We numerically analyze spin squeezing parameters and concurrence in this model, and find that the maximal spin squeezing direction, which refers to the minimal pairwise correlation direction, is strongly influenced by quantum chaos. Entanglement (spin squeezing) sudden death and sudden birth occur alternatively for the periodic and quasi-periodic cases, while only entanglement (spin squeezing) sudden death is found for the chaotic case.
Keywords
Cite
@article{arxiv.1010.0109,
title = {Spin Squeezing, Negative Correlations, and Concurrence in the Quantum Kicked Top Model},
author = {Xiaoqian Wang and Jian Ma and Lijun Song and Xihe Zhang and Xiaoguang Wang},
journal= {arXiv preprint arXiv:1010.0109},
year = {2010}
}
Comments
8 pages, 6 figures