Drive-induced nonlinearities of cavity modes coupled to a transmon ancilla
Yaxing Zhang, Jacob C. Curtis, Christopher S. Wang, Robert J. Schoelkopf, S. M. Girvin · Physical Review A · 2022
When microwave cavity modes and transmon qubits are coupled, the cavity modes inherit nonlinearity from the transmons. Here, the authors investigate how a driving field affects this nonlinearity, comparing analytical, numerical, and experimental results. They show that an off-resonant driving field can even be used to cancel the dominant nonlinearity, extending the time before a quantum state stored in the cavity suffers phase collapse.