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
Contact the author: Please use for correspondence this email.
Submission date: 01. Oct. 2014
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
with the following different title: Super quantum discord for x-type states
Download full preprint: PDF (312 kB), PS ziped (1607 kB)
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.