Preprint
Jul 2026
Self-adjoint extensions of $k$-photon light-matter Hamiltonians
Multiphoton light-matter interactions, in which a bosonic mode exchanges $k$ excitations at a time with a quantum system, are a source of genuine nonlinearity in quantum optics and are increasingly accessible experimentally. Here we study the class of operators $H = H_{\rm mat}\otimes I + I\otimes\omega a^\ast a + \Sig...
Felix Fischer, Felix Knapp, D. Burgarth et al.
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