Unifying Treatment of Discord via Relative Entropy
Lin Zhang, Shao-Ming Fei, and Jun Zhu
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Submission date: 17. Jul. 2013
published in: International journal of theoretical physics, 52 (2013) 6, p. 1946-1955
DOI number (of the published article): 10.1007/s10773-012-1361-x
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We study the monotonicity inequality of relative entropy under completely positive linear maps. A new form of zero-discord state via Petz's monotonicity condition on relative entropy with equality has been derived systematically. A generalization of symmetric zero-discord states is presented and the related physical implications are discussed.