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- W2128201901 abstract "The notion of distance defined on the set of states of a composite quantum system can be used to quantify total, quantum and classical correlations in a unifying way. We provide new closed formulae for classical and total correlations of two-qubit Bell-diagonal states by considering the Bures distance. Complementing the known corresponding expressions for entanglement and more general quantum correlations, we thus complete the quantitative hierarchy of Bures correlations for Bell-diagonal states. We then explicitly calculate Bures correlations for two relevant families of states: Werner states and rank-2 Bell-diagonal states, highlighting the subadditivity which holds for total correlations with respect to the sum of classical and quantum ones when using Bures distance. Finally, we analyse a dynamical model of two independent qubits locally exposed to non-dissipative decoherence channels, where both quantum and classical correlations measured by Bures distance exhibit freezing phenomena, in analogy with other known quantifiers of correlations." @default.
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- W2128201901 date "2014-09-23" @default.
- W2128201901 modified "2023-10-03" @default.
- W2128201901 title "Unifying approach to the quantification of bipartite correlations by Bures distance" @default.
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- W2128201901 doi "https://doi.org/10.1088/1751-8113/47/40/405302" @default.
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