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

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

2010-06-13

arxiv.org/abs/1006.2540v1

PRL 105, 233907 (2010)

Physics

Quantum Physics

5 pages, 3 Figures

Scientific paper

10.1103/PhysRevLett.105.233907

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 using the tunable inductance of a superconducting quantum interference device. It is measured in the quantum regime, where the temperature is significantly less than the resonance frequency (~ 5 GHz). When the length is modulated at approximately twice the static resonance frequency, spontaneous 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. Connections to the dynamical Casimir effect are discussed.

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