Average diagonal entropy in nonequilibrium isolated quantum systems

Olivier Giraud, Ignacio García-Mata
2016 Physical review. E  
The diagonal entropy was introduced as a good entropy candidate especially for isolated quantum systems out of equilibrium. Here we present an analytical calculation of the average diagonal entropy for systems undergoing unitary evolution and an external perturbation in the form of a cyclic quench. We compare our analytical findings with numerical simulations of various many-body quantum systems. Our calculations elucidate various heuristic relations proposed recently in the literature.
doi:10.1103/physreve.94.012122 pmid:27575092 fatcat:ltirsnpyyzdndbwa3ooiz6n3cm