Making ab initio QED functional(s): Nonperturbative and photon-free effective frameworks for strong light-matter coupling.

ABSTRACT: Strong light-matter coupling provides a promising path for the control of quantum matter where the latter is routinely described from first principles. However, combining the quantized nature of light with this ab initio tool set is challenging and merely developing as the coupled light-matter Hilbert space is conceptually different and computational cost quickly becomes overwhelming. In this work, we provide a nonperturbative photon-free formulation of quantum electrodynamics (QED) in the long-wavelength limit, which is formulated solely on the matter Hilbert space and can serve as an accurate starting point for such ab initio methods. The present formulation is an extension of quantum mechanics that recovers the exact results of QED for the zero- and infinite-coupling limit and the infin

SUBMITTER: Schafer C 

PROVIDER: S-EPMC8521676 | biostudies-literature | 2021 Oct

REPOSITORIES: biostudies-literature