Dynamical Lamb effect versus dissipation in superconducting quantum circuits

Abstract

Superconducting circuits provide a new platform to study nonstationary cavity QED phenomena. An example of such a phenomenon is a dynamical Lamb effect which is a parametric excitation of an atom due to the nonadiabatic modulation of its Lamb shift. This effect has been initially introduced for a natural atom in a varying cavity, while we suggested its realization in a superconducting qubit-cavity system with dynamically tunable coupling. In the present paper, we study the interplay between the dynamical Lamb effect and the energy dissipation, which is unavoidable in realistic systems. We find that despite of naive expectations this interplay can lead to unexpected dynamical regimes. One of the most striking results is that photon generation from vacuum can be strongly enhanced due to the qubit relaxation, which opens a new channel for such a process. We also show that dissipation in the cavity can increase the qubit excited state population. Our results can be used for the experimental observation and investigation of the dynamical Lamb effect and accompanying quantum effects.

arXiv comment14 pages

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Cited by in corpus (10)

• Amplified opto-mechanical transduction of virtual radiation pressure
• Algorithmic simulation of far-from-equilibrium dynamics using quantum computer
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• Dynamics of mesoscopic qubit ensemble coupled to cavity: role of collective dark states
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• Laplace transform approach for the dynamics of N qubits coupled to a resonator
• Radiation trapping effect versus superradiance in quantum simulation of light-matter interaction
• Can the dynamical Lamb effect be observed in a superconducting circuit?
• Dynamics of a qubit-oscillator system with periodically varying coupling