Non-Equilibrium DMFT with Inchworm Quantum Monte Carlo

We present a real-time, numerically exact, inchworm quantum Monte Carlo solver for non-equilibrium impurity problems with fully time dependent parameters. Our solver works on the forward-backward Keldysh contour so correlations develop dynamically from an initially uncorrelated tensor product density matrix instead of being generated by an imaginary time evolution. We benchmark and compare this approach with the recently developed inchworm quantum Monte Carlo solver on the full Keldysh contour including equilibrium branch and show applications to quenches of the single-band Hubbard model on the infinite coordination number Bethe lattice within the framework of non-equilibrium dynamical mean field theory.