Variational perturbation theory extends the radius of convergence for steady-state calculations in open quantum systems and replaces pseudo-inverse computations with LU decomposition or Krylov recycling.
We useLUsince its complexity scales asO(2N 3/3) for a system of sizeNwhereasQRscales asO(4N 3/3)
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Variational Perturbation Theory in Open Quantum Systems for Efficient Steady State Computation
Variational perturbation theory extends the radius of convergence for steady-state calculations in open quantum systems and replaces pseudo-inverse computations with LU decomposition or Krylov recycling.