Superquantization Rule for Multistability in Driven-Dissipative Quantum Systems

We present a superquantization rule which indicates the possible robuststationary states of a generic driven-dissipative quantum system.Multistability in a driven cavity mode interacting with a qudit is revealed inthis way within a simple intuitive picture. The accuracy of thesuperquantization approach is confirmed by numerical simulations of theunderlying quantum model. In the case when the qudit is composed of severaltwo-level emitters coupled homogeneously to the cavity, we demonstrate therobustness of the superquantized steady states to single-emitter decay.