For any bipartite state, how strongly can one subsystem be quantum correlated with another? Using the Koashi–Winter relation, we study the upper bound of purified quantum discord, which is given by the sum of the von Neumann entropy of the unmeasured subsystem and the entanglement of formation shared between the unmeasured subsystem with the environment. In particular, we find that Luo et al.’s conjecture on the quantum correlations and the Lindblad conjecture are true under the condition that the entanglement of formation vanishes. Let the discord distance be defined as the difference between the left discord and the right discord. If the Lindblad conjecture is true, we show that the joint entropy is a tight upper bound for the discord distance. Further, we obtain a necessary and sufficient condition for saturating upper bounds of purified quantum discord and discord distance separately with the equality conditions for the Araki–Lieb inequality and the Lindblad conjecture.
Quantum Information Processing – Springer Journals
Published: Feb 13, 2015
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