科研之友
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摘要
Quantum discord is a measure of quantumness of correlations in bipartite states, which characterizes the difference between quantum mutual information and classical correlations. Based on the generators of Lie algebra su(d), we study the quantum discord for two families of two-qudit states with maximally mixed marginals, and derive some upper bounds of quantum discord for such states by evaluating classical correlations. Furthermore, we make a comparison among total correlations, classical correlations and quantum discord for a class of special states in high-dimensional two-partite systems.
