We propose an efficient algorithm to numerically solve Anderson impurity problems using matrix product states. By introducing a modified chain mapping we obtain significantly lower entanglement, as compared to all previous attempts, while keeping the short-range nature of the couplings. Our approach naturally extends to finite temperatures, with applications to dynamical mean field theory, non-equilibrium dynamics and quantum transport.
@article{arxiv.2012.01424,
title = {Efficient mapping for Anderson impurity problems with matrix product states},
author = {Lucas Kohn and Giuseppe E. Santoro},
journal= {arXiv preprint arXiv:2012.01424},
year = {2021}
}