Generic construction of efficient matrix product operators

@article{Hubig2017GenericCO,
  title={Generic construction of efficient matrix product operators},
  author={Claudius Hubig and I. P. McCulloch and Ulrich Schollwock},
  journal={Physical Review B},
  year={2017},
  volume={95},
  pages={12}
}
Matrix product operators (MPOs) are at the heart of the second-generation density matrix renormalization group (DMRG) algorithm formulated in matrix product state language. We first summarize the widely known facts on MPO arithmetic and representations of single-site operators. Second, we introduce three compression methods (rescaled SVD, deparallelization, and delinearization) for MPOs and show that it is possible to construct efficient representations of arbitrary operators using MPO… 

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