Super quantum discord for two-qubit X-type states and the dynamics under nondissipative channels

Tao Li, Teng Ma, Yao-Kun Wang, Shao-Ming Fei, and Zhi-Xi Wang

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Submission date: 01. Oct. 2014
Pages: 12
published in: International journal of theoretical physics, 54 (2015) 2, p. 680-688 
DOI number (of the published article): 10.1007/s10773-014-2260-0
Bibtex
with the following different title: Super quantum discord for x-type states
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Abstract:
Super quantum discord is a kind of quantum correlations defined in terms of weak measurements for obtaining the maximal classical correlations in a bipartite systems. We derive explicitly the analytical formula for general X-type two-qubit states. The evolution of these states under local and global bit-flip and phase-flip channels are investigated. The relations among the super quantum discord, its evolution and the week measurement strength have been analyzed in detail.