Exact work statistics of quantum quenches in the anisotropic XY model.

  title={Exact work statistics of quantum quenches in the anisotropic XY model.},
  author={Francis A. Bayocboc and Francis N C Paraan},
  journal={Physical review. E, Statistical, nonlinear, and soft matter physics},
  volume={92 3},
We derive exact analytic expressions for the average work done and work fluctuations in instantaneous quenches of the ground and thermal states of a one-dimensional anisotropic XY model. The average work and a quantum fluctuation relation is used to determine the amount of irreversible entropy produced during the quench, eventually revealing how the closing of the excitation gap leads to increased dissipated work. The work fluctuation is calculated and shown to exhibit nonanalytic behavior as… 

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