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Akhtarshenas S J, Mohammadi H, Nassajpour V, Mousavi F S. Quantum Discord of two-qubit states. ICOP & ICPET _ INPC _ ICOFS 2014; 20 :885-888
URL: http://opsi.ir/article-1-357-en.html
URL: http://opsi.ir/article-1-357-en.html
Abstract: (4970 Views)
In this paper, we provide a simple relation for the conditional entropy as the difference of two Shannon entropies. This relation leads to an analytical formula for discord of some special two-qubit states and also it presents a tight upper bound for quantum discord of a general two-qubit state. We also present an analytical procedure of optimization and obtain conditions under which the quantum conditional entropy of a general two-qubit state is stationary.
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