Theoretical Description of Micromaser in the Ultrastrong-Coupling Regime

Abstract

We theoretically investigate an ultrastrongly-coupled micromaser based on Rydberg atoms interacting with a superconducting LC resonator, where the common rotating-wave approximation and slowly-varying-envelope approximation are no longer applicable. The effect of counter-rotating terms on the masing dynamics is studied in detail. We find that the intraresonator electric energy declines and the microwave oscillation frequency shifts significantly in the regime of ultrastrong coupling. Additionally, the micromaser phase fluctuation is suppressed, resulting in a reduced spectral linewidth.

10 pages, 3 figures

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• Charge-Qubit-Resonator-Interface-Based Nonlinear Circuit QED
• Open Ising Model Perturbed by Classical Colored Noises
• Feedback control of persistent-current oscillation based on the atomic-clock technique
• The design of an experimental platform for hybridization of atomic and superconducting quantum systems
• Relaxation of Rabi Dynamics in a Superconducting Multiple-Qubit Circuit
• GHZ-like states in the Qubit-Qudit Rabi Model