Generalized information deficit and quantum discord in spin chains

N. CANOSA; L. CILIBERTI; R. ROSSIGNOLI

Rio de Janeiro

Congreso; Complex systems foundations and applications; 2013

CNPQ

We examine the quantum correlations of spin pairs in spin 1/2 chains in an applied transverse field $B$, through the analysis of the quantum discord and the generalized information deficit based on general entropic forms. The latter contains, as particular cases, the von Neumann based one-way information deficit, the geometric discord and the $q$-discord. It is shown [1] that all these quantities provide the same qualitative information. In the case of Heisenberg-type $XY$ chains, they all reach full range for $|B|