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Hilbert-Schmidt measure of pairwise quantum discord for three-qubit $X$ states

The Hilbert-Schmidt distance between a mixed three-qubit state and its closest state is used to quantify the amount of pairwise quantum correlations in a tripartite system. Analytical expressions of geometric quantum discord are derived. A particular attention is devoted to two special classes of three-qubit $X$ states. They include three-qubit states of ${\rm W}$, ${\rm GHZ}$ and Bell type. We also discuss the monogamy property of geometric quantum discord in some mixed three-qubit systems.

preprint2015arXivOpen access
M. DaoudR. Ahl LaamaraS. Seddik
quant-ph
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Open access3 authors1 topic
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M. DaoudR. Ahl LaamaraS. Seddik

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