Monogamy of Quantum Discord

Details Monogamy of Quantum Discord Monogamy of Quantum Discord

2011-11-22

arxiv.org/abs/1111.5163v3

Physics

Quantum Physics

Abstract and introduction revised, references added

Scientific paper

Quantum discord is not monogamous. We consider a pure tripartite state and show that the monogamy inequality of quantum discord is related with a relation between quantum mutual information and entanglement of formation of two parties. The upper bounds of quantum discord and classical correlation are presented. Our results relate the correlations present in a bipartite system with the monogamy or polygamy property of quantum discord in a tripartite pure state. The relation, which is about three important concepts in quantum information theory, quantum discord, entanglement of formation and mutual information, may provide new insights for their further understanding.

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