Correlations between Complexity and Entanglement in a One-Dimensional XY Model

Abstract

Many people believe that the study of complex quantum systems may be simplified by first analyzing the static and dynamic entanglement present in those systems [Phys. Rev. A 66 (2002) 032110]. In this paper, we attempt to complement such notion by adding an order–disorder quantifier called statistical complexity and studying how it is correlated with the degree of entanglement as measured by the concurrence quantifier. We perform such an analysis with reference to a representative system chosen from condensed matter theory, the so-called XY model. Some interesting insight is obtained as the concurrence and the complexity become correlated in an unexpected fashion.