In the circuit quantum electrodynamics architecture, both the resonancefrequency and the coupling of superconducting qubits to microwave field modescan be controlled via external electric and magnetic fields to explore qubit --photon dynamics in a wide parameter range. Here, we experimentally demonstrateand analyze a scheme for tuning the coupling between a transmon qubit and amicrowave resonator using a single coherent drive tone. We treat the transmonas a three-level system with the qubit subspace defined by the ground and thesecond excited states. If the drive frequency matches the difference betweenthe resonator and the qubit frequency, a Jaynes-Cummings type interaction isinduced, which is tunable both in amplitude and phase. We show that couplingstrengths of about 10 MHz can be achieved in our setup, limited only by theanharmonicity of the transmon qubit. This scheme has been successfully used togenerate microwave photons with controlled temporal shape [Pechal et al., Phys.Rev. X 4, 041010 (2014)] and can be directly implemented with superconductingquantum devices featuring larger anharmonicity for higher coupling strengths.
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