Analytical solutions and criteria for the quantum discord of two-qubit X-states

Analytical solutions and criteria for the quantum discord of two-qubit X-states Except for a few special states, computing quantum discord remains a complicated optimization process. In this paper, we present analytical solutions for computing quantum discord of the most general class of $$X$$ X -states and the criteria for each analytical solution to be valid. We discuss parameter regions that correspond to different analytical solutions and explain the underlying reasons for such structure to exist. We apply our formalism to study both arbitrary $$X$$ X -states and $$X$$ X -states with certain symmetries. We find that our analytical formalism is in excellent agreement with numerical calculation of quantum discord in both cases. Quantum Information Processing Springer Journals

Analytical solutions and criteria for the quantum discord of two-qubit X-states

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Springer US
Copyright © 2015 by Springer Science+Business Media New York
Physics; Quantum Information Technology, Spintronics; Quantum Computing; Data Structures, Cryptology and Information Theory; Quantum Physics; Mathematical Physics
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