Entanglement Observables and Witnesses for Interacting Quantum Spin Systems
Quantum Physics
2009-11-10 v2 Statistical Mechanics
Strongly Correlated Electrons
Abstract
We discuss the detection of entanglement in interacting quantum spin systems. First, thermodynamic Hamiltonian-based witnesses are computed for a general class of one-dimensional spin-1/2 models. Second, we introduce optimal bipartite entanglement observables. We show that a bipartite entanglement measure can generally be associated to a set of independent two-body spin observables whose expectation values can be used to witness entanglement. The number of necessary observables is ruled by the symmetries of the model. Illustrative examples are presented.
Cite
@article{arxiv.quant-ph/0412099,
title = {Entanglement Observables and Witnesses for Interacting Quantum Spin Systems},
author = {L. -A. Wu and S. Bandyopadhyay and M. S. Sarandy and D. A. Lidar},
journal= {arXiv preprint arXiv:quant-ph/0412099},
year = {2009}
}
Comments
5 pages, 1 figure. v2: published version