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Journal of Physics Conference Series

Conditional evolution of vacuum state in dynamical Casimir effect

V O Sheremetyev, Ekaterina S. Trifanova, Alexander Trifanov

Published Oct 27, 2014• 2 citations
Publisher

Abstract

We analytically investigate the process of photons creation in the empty cavity with trembling ideal conductive boundary. Quantum state of the intracavity field is monitored by the two-level atom passing through the system and undergoing the subsequent state measurement in the ionizing chamber. The resulted field evolution conditioned by atomic state detection result is of the most interest.

DOI
10.1088/1742-6596/541/1/012105

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We analytically investigate the process of photons creation in the empty cavity with trembling ideal conductive boundary. Quantum state of the intracavity field is monitored by the two-level atom passing through the system and undergoing the subsequent state measurement in the ionizing chamber. The resulted field evolution conditioned by atomic state detection result is of the most interest.
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An atom interacting with a quantized electromagnetic field in a cavity with time-dependent parameters is considered. Variation of the cavity parameters results in nonstationary dynamics of the field which leads, in turn, to excitation of the atom, even if photons were initially absent in the cavity. We distinguish three mechanisms of such excitation: excitation due to absorption of real photons created by the dynamical Casimir effect, excitation due to absorption of virtual photons during the transient process, and excitation due to nonadiabatic parametric modulation of the atomic Lamb shift. The last mechanism has no relation to the dynamical Casimir effect and thus should be considered as a new vacuum QED effect. Normally all these three mechanisms give a contribution to the amplitude of the atom excitation and are accompanied by the creation of photons. Therefore the presence of an atom in the cavity alters the average number of created photons in comparison with the case of an empty non-stationary cavity. Our consideration is based mainly on a simple model of a two-level atom interacting with a single mode of quantized electromagnetic field. However, our results are qualitatively valid for more realistic models.
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