Comment on "Quantum discord through the generalized entropy in bipartite quantum states"
Quantum Physics
2015-04-09 v1
Abstract
In [X.-W. Hou, Z.-P. Huang, S. Chen, Eur. Phys. J. D 68, 1 (2014)], Hou et al. present, using Tsallis' entropy, possible generalizations of the quantum discord measure, finding original results. As for the mutual informations and discord, we show here that these two types of quantifiers can take negative values. In the two qubits instance we further determine in which regions they are non-negative. Additionally, we study alternative generalizations on the basis of R\'enyi entropies.
Keywords
Cite
@article{arxiv.1504.02046,
title = {Comment on "Quantum discord through the generalized entropy in bipartite quantum states"},
author = {Guido Bellomo and Angelo Plastino and Anna P. Majtey and Angel R. Plastino},
journal= {arXiv preprint arXiv:1504.02046},
year = {2015}
}
Comments
5 pages, 4 figures