A pedagogical overview of quantum discord
Abstract
Recent measures of nonclassical correlations are motivated by different notions of classicality and operational means. Quantum discord has received a great deal of attention in studies involving quantum computation, metrology, dynamics, many-body physics, and thermodynamics. In this article I show how quantum discord is different from quantum entanglement from a pedagogical point of view. I begin with a pedagogical introduction to quantum entanglement and quantum discord, followed by a historical review of quantum discord. Next, I give a novel definition of quantum discord in terms of any classically extractable information, a approach that is fitting for the current avenues of research. Lastly, I put forth several arguments for why discord is an interesting quantity to study and why it is of interest to so many researchers in the community.
Keywords
Cite
@article{arxiv.1312.7676,
title = {A pedagogical overview of quantum discord},
author = {Kavan Modi},
journal= {arXiv preprint arXiv:1312.7676},
year = {2014}
}
Comments
17 pages, 6 figures, to appear in special OSID volume of on open systems