Unified entropic measures of quantum correlations induced by local measurements

被引:9
作者
Bosyk, G. M. [1 ]
Bellomo, G. [1 ]
Zozor, S. [2 ]
Portesi, M. [1 ]
Lamberti, P. W. [3 ,4 ]
机构
[1] UNLP, CONICET, Fac Ciencias Exactas, Inst Fis La Plata, Casilla Correo 67, RA-1900 La Plata, Buenos Aires, Argentina
[2] CNRS, GIPSA Lab, Lab Grenoblois Image Parole Signal & Automat, 11 Rue Math, F-38402 St Martin Dheres, France
[3] Univ Nacl Cordoba, Fac Matemat Astron & Fis, Ave Medina Allende S-N,Ciudad Univ,X5000HUA, Cordoba, Argentina
[4] Consejo Nacl Invest Cient & Tecn, Ave Medina Allende S-N,Ciudad Univ,X5000HUA, Cordoba, Argentina
关键词
Quantum correlations; Quantum unified entropies; Local projective measurements; GENERAL-PROPERTIES; DISCORD;
D O I
10.1016/j.physa.2016.06.131
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
We introduce quantum correlation measures based on the minimal change in unified entropies induced by local rank-one projective measurements, divided by a factor that depends on the generalized purity of the system in the case of nonadditive entropies. In this way, we overcome the issue of the artificial increasing of the value of quantum correlation measures based on nonadditive entropies when an uncorrelated ancilla is appended to the system, without changing the computability of our entropic correlation measures with respect to the previous ones. Moreover, we recover as limiting cases the quantum correlation measures based on von Neumann and Renyi entropies (i.e., additive entropies), for which the adjustment factor becomes trivial. In addition, we distinguish between total and semiquantum correlations and obtain some inequalities between them. Finally, we obtain analytical expressions of the entropic correlation measures for typical quantum bipartite systems. (C) 2016 Elsevier B.V. All rights reserved.
引用
收藏
页码:930 / 939
页数:10
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