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Journal Articles Physica A: Statistical Mechanics and its Applications Year : 2016

Unified entropic measures of quantum correlations induced by local measurements

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Abstract

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 Rényi 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.

Dates and versions

hal-01348669 , version 1 (25-07-2016)

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Gustavo Martin Bosyk, Guido Bellomo, Steeve Zozor, Mariela Portesi, Pedro Walter Lamberti. Unified entropic measures of quantum correlations induced by local measurements. Physica A: Statistical Mechanics and its Applications, 2016, 462, pp.930-939. ⟨10.1016/j.physa.2016.06.131⟩. ⟨hal-01348669⟩
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