Dynamics of quantum coherence and quantum Fisher information after a sudden quench
R. Jafari, Alireza Akbari
Abstract
The dynamics of relative entropy and ${l}_{1}$ norm of coherence, as well as, the Wigner-Yanase skew and quantum Fisher information are studied in the one-dimensional $XY$ spin chain in the presence of a time-dependent transverse magnetic field. We show that, independent of the initial state of the system and while the relative entropy of coherence, the ${l}_{1}$ norm of coherence, and quantum Fisher information are incapable, surprisingly, the Wigner-Yanase skew information dynamic can truly spotlight the equilibrium critical point. We also observe that, when the system is quenched to the critical point, these quantities show suppressions and revivals. Moreover, the first suppression (revival) time scales linearly with the system size and its scaling ratio is unique for all quenches independent of the initial phase of the system. This is the promised universality of the first suppression (revival) time.