Modern Floquet theory for critical Schrödinger Cat Qubits
I will present our newly developed framework for characterizing many-body out-of-equilibrium stationary states. The typical method to theoretically tackle periodically driven systems consists in using the canonical quantum description and applying the rotating wave approximation (RWA). This however leads to inaccurate results for off-resonant driving. We introduce an alternative operator basis that provides a precise description of driven open quantum many-body systems while maintaining simplicity. The method outperforms existing approaches in both classical and quantum contexts. Furthermore, it resolves the longstanding challenge of reconciling quantum and classical formalisms. State-of-the-art results for the generation and stabilization of critical Kerr-cat qubits are corrected.