Mixed-state fidelity susceptibility through iterated commutator series expansion.

@article{Tonchev2014MixedstateFS,
  title={Mixed-state fidelity susceptibility through iterated commutator series expansion.},
  author={N. Tonchev},
  journal={Physical review. E, Statistical, nonlinear, and soft matter physics},
  year={2014},
  volume={90 5-1},
  pages={
          052103
        }
}
  • N. Tonchev
  • Published 2014
  • Mathematics, Physics, Medicine
  • Physical review. E, Statistical, nonlinear, and soft matter physics
We present a perturbative approach to the problem of computation of mixed-state fidelity susceptibility (MFS) for thermal states. The mathematical techniques used provide an analytical expression for the MFS as a formal expansion in terms of the thermodynamic mean values of successively higher commutators of the Hamiltonian with the operator involved through the control parameter. That expression is naturally divided into two parts: the usual isothermal susceptibility and a constituent in the… Expand

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References

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