Delocalization of quantum information in long-range interacting systems

We investigate the delocalization of quantum information in the nonequilibrium dynamics of the XYspin chain with asymptotically decaying interactions \sim 1/r^{\alpha} As a figure of merit, we employ the tripartite mutual information (TMI), whose sign indicates if quantum information is predominantly shared globally. Interestingly, the sign of the TMI distinguishes regimes of the exponent \alphathat are known for different behaviour of...