Entanglement Renormalization of Thermofield Double States.

@article{Lin2021EntanglementRO,
  title={Entanglement Renormalization of Thermofield Double States.},
  author={Cheng-Ju Lin and Zhi Li and Timothy H. Hsieh},
  journal={Physical review letters},
  year={2021},
  volume={127 8},
  pages={
          080602
        }
}
Entanglement renormalization is a method for "coarse graining" a quantum state in real space, with the multiscale entanglement renormalization ansatz as a notable example. We obtain an entanglement renormalization scheme for finite-temperature (Gibbs) states by applying the multiscale entanglement renormalization ansatz to their canonical purification, the thermofield double state. As an example, we find an analytically exact renormalization circuit for a finite-temperature two-dimensional… 

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