Effective Hamiltonian for an off-resonantly driven qubit-cavity system
The paper derives an effective Hamiltonian for a qubit-cavity system driven by multiple tones using a 'Late RWA' approach. This method retains slowly rotating terms from multi-tone drives, providing a general framework to accurately model driven dynamics across different platforms. It successfully reproduces experimental results like ac Stark shifts and two-mode squeezing in circuit QED.