Zeno physics in ultrastrong circuit QED

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We study the Zeno and anti-Zeno effects in a superconducting qubit interacting strongly and ultrastrongly with a microwave resonator.

• Using a model of a frequently measured two-level system interacting with a quantized mode, we show different behaviors and total control of the Zeno times depending on whether the rotating-wave approximation can be applied in the Jaynes-Cummings model, or not.
• We exemplify showing the strong dependence of our results with the properties of the initial field states and suggest applications for quantum tomography.