Classical extension of quantum-correlated separable states
Quantum Physics
2015-05-27 v1
Abstract
Li and Luo [Phys. Rev. A 78 (2008), 024303] discovered a remarkable relation between discord and entanglement. It establishes that all separable states can be obtained via reduction of a classicaly-correlated state "living" in a space of larger dimension. Starting from this result, we discuss here an optimal classical extension of separable states and explore this notion for low-dimensional systems. We find that the larger the dimension of the classical extension, the larger the discord in the original separable state. Further, we analyze separable states of maximum discord of two qubits, and their associated classical extensions.
Cite
@article{arxiv.1504.02077,
title = {Classical extension of quantum-correlated separable states},
author = {Guido Bellomo and Angelo Plastino and Angel R. Plastino},
journal= {arXiv preprint arXiv:1504.02077},
year = {2015}
}
Comments
13 pages, 5 figures. To be published in Int. J. Quantum Info