Ming-Liang Hu, Heng Fan, Dong-Ping Tian
The information-theoretic definition of quantum correlation, e.g., quantum discord, is measurement dependent. By considering the formalism of weak measurements which include the projective measurement as a limiting case, we show that while weak measurements can enable one to capture more quantum correlation in a state, it can also induce other counterintuitive effects. Specifically, we show that the weak measurements with different strengths can impose different orderings of quantum states, and can change the monogamous character for certain classes of states as well. In this sense, we say that the weak measurements play a dual role in defining quantum discord.
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http://arxiv.org/abs/1304.5074
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