Probing Two Driven Double Quantum Dots Strongly Coupled to a Cavity

We experimentally and theoretically study a driven hybrid circuit quantum electrodynamics (cQED) system beyond the dispersive coupling regime. Treating the cavity as part of the driven system, we develop a theory applicable to such strongly coupled and to multiqubit systems. The fringes measured for a single driven double quantum dot (DQD)-cavity setting and the enlarged splittings of the hybrid Floquet states in the presence of a second DQD are well reproduced with our model. This opens a path to study Floquet states of multiqubit systems with arbitrarily strong coupling and reveals a new perspective for understanding strongly driven hybrid systems.

Automated summary

We experimentally and theoretically investigate a driven hybrid circuit quantum electrodynamics (cQED) system that goes beyond the dispersive coupling regime. By considering the cavity as part of the driven system, we develop a theory that is applicable to strongly coupled and multiqubit systems. Our model successfully reproduces the measured fringes in a single driven double quantum dot (DQD)-cavity setup and the enlarged splittings of the hybrid Floquet states in the presence of a second DQD. This work opens up avenues for studying Floquet states of multiqubit systems with arbitrarily strong coupling and provides a new perspective for understanding strongly driven hybrid systems.