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Super quantum discord for a class of two-qubit states with weak measurement

So far, super quantum discord has been calculated explicitly only for Bell-diagonal states and expressions for more general quantum states are not known. In this paper, we derive explicit expressions for super quantum discord for a larger class of two-qubit states, namely, a 4-parameter family of two-qubit states. We observe that, weak measurements obtain more quantumness of correlations than strong measurements. As an application, the dynamic behavior of the super quantum discord under decoherence channel is investigated. We find that, the super quantum discord decreases monotonically as a function of the measurement strength parameter.

preprint2014arXivOpen access
H. EftekhariE. Faizi
quant-ph
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Open access2 authors1 topic
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H. EftekhariE. Faizi

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