Closed-Form Generators for Perturbative Transformations in Static and Periodically Driven Quantum Systems

Abstract

We introduce a unified framework for the practical implementation of perturbative transformations that overcomes the limitations of existing construction methods. The central result is a closed-form operator expression for the generator of a broad class of perturbative transformations in systems composed of finite-dimensional and bosonic subspaces. We further generalize the construction to time-dependent systems with periodic perturbations, obtaining a solution that remains valid across low-, intermediate-, and high-frequency regimes, provided that the transition channels eliminated by the transformation remain sufficiently detuned. The derived framework remains independent of the particular perturbative scheme and therefore applies to a large class of perturbative approaches for both time independent and time dependent transformations. We demonstrate the scope and accuracy of the method by deriving effective dispersive interactions in exemplary anharmonic and periodically driven light--matter systems.