Comment on "Quantum discord through the generalized entropy in bipartite quantum states"

被引：4
|
作者：
Bellomo, Guido [1 ]
Plastino, Angelo [1 ]
Majtey, Anna P. [2 ]
Plastino, Angel R. [3 ,4 ,5 ]
机构：
[1] Univ Nacl La Plata, IFLP CCT CONICET, RA-1900 La Plata, Buenos Aires, Argentina
[2] Univ Fed Rio de Janeiro, Inst Fis, BR-21942972 Rio De Janeiro, Brazil
[3] Univ Nacl Noroeste Prov Buenos Aires UNNOBA, CeBio, Junin, Argentina
[4] Univ Nacl Noroeste Prov Buenos Aires UNNOBA, Secretaria Invest, Junin, Argentina
[5] Consejo Nacl Invest Cient & Tecn, Junin, Argentina
来源：
EUROPEAN PHYSICAL JOURNAL D | 2014年 / 68卷 / 11期
关键词：
Quantum Information;
D O I：
10.1140/epjd/e2014-50474-x
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
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 Renyi entropies.
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页数：4
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