Volume 20 -                   ICOP & ICPET _ INPC _ ICOFS 2014, 20 - : 885-888 | Back to browse issues page

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Quantum Discord of two-qubit states
S. Javad Akhtarshenas , Hamidreza Mohammadi , Vahid Nassajpour , Fahimeh S Mousavi * 1
Abstract:   (4947 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.
Keywords: Quantum correlation, Quantum discord, Shannon entropy, Tight upper bound.
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Type of Study: Research | Subject: Special
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