| Summary: | We study the time evolution of magnetization and entanglement for initial
states with local excitations, created upon the ferromagnetic ground state of
the XY chain. For excitations corresponding to a single or two well separated
domain walls, the magnetization profile has a simple hydrodynamic limit, which
has a standard interpretation in terms of quasiparticles. In contrast, for a
spin-flip we obtain an interference term, which has to do with the nonlocality
of the excitation in the fermionic basis. Surprisingly, for the single domain
wall the hydrodynamic limit of the entropy and magnetization profiles are found
to be directly related. Furthermore, the entropy profile is additive for the
double domain wall, whereas in case of the spin-flip excitation one has a
nontrivial behaviour.
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