Geodesic
Quantum discord in a three-spin system in an external magnetic field
Teoretičeskaâ i matematičeskaâ fizika, Tome 181 (2014) no. 2, pp. 387-400 Cet article a éte moissonné depuis la source Math-Net.Ru

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We study quantum correlations in a bipartite heteronuclear $2{\times}1$ system with three spins $S=1/2$ in an external magnetic field at high and low temperatures. We analytically determine the minimum of the system conditional entropy at high temperatures after measurements on the one-spin subsystem for any relations between the spin frequencies of both subsystems. As a result, we obtain analytic expressions for the measure of quantum correlations, i.e., for the quantum discord in three-qubit systems, for the first time in the high-temperature case. We obtain the minimum of the low-temperature conditional entropy numerically. We investigate the quantum discord evolution and the relation between the classical and quantum correlations.
Keywords: quantum correlation, quantum discord, quantum conditional entropy, mutual information, reduced density matrix. 
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S. I. Doronin; E. I. Kuznetsova; É. B. Fel'dman. Quantum discord in a three-spin system in an external magnetic field. Teoretičeskaâ i matematičeskaâ fizika, Tome 181 (2014) no. 2, pp. 387-400. http://geodesic.mathdoc.fr/item/TMF_2014_181_2_a10/

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