Trigonometric SU(N) Richardson–Gaudin models and dissipative multi-level atomic systems

Abstract

We derive the exact solution of a system of N-level atoms in contact with a Markovian reservoir. The resulting Liouvillian expressed in a vectorized basis is mapped to an SU(N) trigonometric Richardson–Gaudin model whose exact solution is given by a set of non-linear coupled equations. For N = 2 (SU(2)) we recover the exact solution of (2019 Phys. Rev. Lett. 122 010401). We then study the SU(3) case for three-level atom systems and discuss the properties of the steady state and dissipative gaps for finite systems as well as for the thermodynamic limit.