Spin dynamics in the XY model

We investigate the dynamics of entanglement, quantum correlation and classical correlation for the one-dimensional XY model in a transverse magnetic field. With the initial state polarized along the z axis, we find that the first maximum of the classical correlation between the nearest neighbor sites peaks around the critical point for large anisotropy parameter. It may indicate the quantum phase transition. For all kinds of correlation, we find that their behaviors between the nearest neighbor sites are significantly different from those of the next-nearest neighbor sites. (authors)