Quantum metrology with nonequilibrium steady states of quantum spin chains

  title={Quantum metrology with nonequilibrium steady states of quantum spin chains},
  author={Ugo Marzolino and Tomavz Prosen},
  journal={Physical Review A},
We consider parameter estimations with probes being the boundary driven/dissipated non- equilibrium steady states of XXZ spin 1/2 chains. The parameters to be estimated are the dis- sipation coupling and the anisotropy of the spin-spin interaction. In the weak coupling regime we compute the scaling of the Fisher information, i.e. the inverse best sensitivity among all estimators, with the number of spins. We find superlinear scalings and transitions between the distinct, isotropic and… 

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