Speaker
Davide Lonigro
(BA)
Description
We show that the single-excitation interaction of a family of n qubits with a structured boson field can be effectively modeled by a singular finite-rank perturbation Friedrichs-Lee model of a Hamiltonian with n eigenvalues; the resulting perturbation preserves the absolutely continuous spectrum but drastically modifies the singular spectrum. This structure is shown to be universal in the sense that, by fixing n independent states, any self-adjoint operator may be recast as a Friedrichs-Lee model. Some peculiar examples are presented and discussed.
Primary author
Davide Lonigro
(BA)
