Vaibhav Madhok, Animesh Datta
We show quantum discord to be a resource in quantum information processing. This is accomplished by proving a relation between quantum discord and the yield of the quantum protocols. Our results are derived by studying the fully quantum Slepian-Wolf protocol -- a unification of all bipartite, unidirectional and memoryless quantum communication protocols -- in the presence of noise. As examples, we elucidate the significance of quantum discord in quantum teleportation, superdense coding, and entanglement distillation. Finally, we provide the first quantitative relation between quantum discord and the query complexity of quantum computations.
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http://arxiv.org/abs/1204.6042
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