Entanglement of degenerate ground state for spin 1 and 1/2 pair
Quantum Physics
2007-05-23 v2
Abstract
We study the entanglement feature of the ground state of a system composed of spin 1 and 1/2 parts. The concurrence vector is shown to be consistent with the measurement of von Neumann entropy for such system. In the light of the ground state degeneracy, we suggest a average concurrence to measure the entanglement of Hilbert subspace. The entanglement property of both a general superposition as well as the mixture of the degenerate ground states are discussed by means of average concurrence and the negativity respectively.
Cite
@article{arxiv.quant-ph/0408155,
title = {Entanglement of degenerate ground state for spin 1 and 1/2 pair},
author = {You-Quan Li and Guo-Qiang Zhu and Xue-An Zhao},
journal= {arXiv preprint arXiv:quant-ph/0408155},
year = {2007}
}
Comments
5 pages, 4 figures; one figure is replaced and one subsection is revised