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Stationary entropies after a quench from excited states in the Ising chain

Stationary entropies after a quench from excited states in the Ising chain

We consider the asymptotic state after a sudden quench of the magnetic field in the transverse field quantum Ising chain starting from excited states of the pre-quench Hamiltonian. We compute the thermodynamic entropies of the generalised Gibbs and the diagonal ensembles and we find that the generalised Gibbs entropy is …