We consider the nonstationary circuit QED setup in which a 3-level artificial atom in the ∆configuration interacts with a single-mode cavity field of natural frequency ω. It is demonstrated that when some atomic energy level(s) undergoes a weak harmonic modulation, photons can be generated from vacuum via effective 1-and 3-photon transitions, while the atom remains approximately in the ground state. These phenomena occur in the dispersive regime when the modulation frequency is accurately tuned near ω and 3ω, respectively, and the generated field states exhibit strikingly different statistics from the squeezed vacuum state attained in standard cavity dynamical Casimir effect.arXiv:1805.04887v2 [quant-ph]
A general Lagrangian for a point particle that moves across a viscous field quadratically dependent on the velocity is found. Afterward, the system is quantized via the Weyl quantization rule, and an explicit expression for the wave function in phase space is found.
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