Photon Generation in an Electromagnetic Cavity with a Time-Dependent Boundary

被引：129
作者：
Wilson, C. M. [1 ]
Duty, T. [2 ]
Sandberg, M. [1 ]
Persson, F. [1 ]
Shumeiko, V. [1 ]
Delsing, P. [1 ]
机构：
[1] Chalmers Univ Technol, S-41296 Gothenburg, Sweden
[2] Univ Queensland, Sch Math & Phys, St Lucia, Qld 4072, Australia
来源：
PHYSICAL REVIEW LETTERS | 2010年 / 105卷 / 23期
关键词：
QUANTUM; AMPLIFICATION; EXCITATION; RADIATION; NOISE; FIELD;
D O I：
10.1103/PhysRevLett.105.233907
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
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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页数：4
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