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Multi-orbital quantum impurity models with general interaction andhybridization terms appear in a wide range of applications including embedding,quantum transport, and nanoscience. However, most quantum impurity solvers arerestricted to a few impurity orbitals, discretized baths, diagonalhybridizations, or density-density interactions. Here, we generalize theinchworm quantum Monte Carlo method to the interaction expansion and exploreits application to typical single- and multi-orbital problems encountered ininvestigations of impurity and lattice models. Our implementation genericallyoutperforms bare and bold-line quantum Monte Carlo algorithms in theinteraction expansion. So far, for the systems studied here, it remainsinferior to the more specialized hybridization expansion and auxiliary fieldalgorithms. The problem of convergence to unphysical fixed points, whichhampers so-called bold-line methods, is not encountered in inchworm MonteCarlo.

Interaction expansion inchworm Monte Carlo solver for lattice and impurity models