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Phys Rev Lett. 2010 Dec 3;105(23):233907. Epub 2010 Dec 2.

Photon generation in an electromagnetic cavity with a time-dependent boundary.

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1
Microtechnology and Nanoscience, Chalmers University of Technology, S-41296 Göteborg, Sweden.

Abstract

We report the observation of photon generation in a microwave cavity with a time-dependent boundary condition. Our system is a microfabricated quarter-wave coplanar waveguide cavity. The electrical length of the cavity is varied by using the tunable inductance of a superconducting quantum interference device. It is measured at a temperature significantly less than the resonance frequency. When the length is modulated at approximately twice the static resonance frequency, spontaneous parametric oscillations of the cavity field are observed. Time-resolved measurements of the dynamical state of the cavity show multiple stable states. The behavior is well described by theory. Our results may be considered a preliminary step towards demonstrating the dynamical Casimir effect.

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