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A note on one-way quantum deficit and quantum discord

One-way quantum deficit and quantum discord are two important measures of quantum correlations. We revisit the relationship between them in two-qubit systems. We investigate the conditions that both one-way quantum deficit and quantum discord have the same optimal measurement ensembles, and demonstrate that one-way quantum deficit can be derived from the quantum discord for a class of X states. Moreover, we give an explicit relation between one-way quantum deficit and entanglement of formation. We show that under phase damping channel both one-way quantum deficit and quantum discord evolve exactly in the same way for four parameters X states. Some examples are presented in details.

preprint2016arXivOpen access
Biao-Liang YeShao-Ming Fei
quant-ph
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Open access2 authors1 topic
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Biao-Liang YeShao-Ming Fei

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