Photon Generation in an Electromagnetic Cavity with a Time-Dependent Boundary
Photon Generation in an Electromagnetic Cavity with a Time-Dependent Boundary
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DOI：
10.1103/physrevlett.105.233907
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发表时间：
2010-12-03
影响因子：
8.6
通讯作者：
Delsing, P.
中科院分区：
文献类型：
--
作者：
Wilson, C. M.;Duty, T.;Delsing, P.
本文报道了在含时边界条件下微波腔中光子产生的观测结果。我们的系统是一个微加工的四分之一波长共面波导腔。利用超导量子干涉器件的可调谐电感改变腔的电长度。它是在明显低于谐振频率的温度下测量的。当长度调制在约两倍的静态谐振频率，自发参量振荡的腔场观察。时间分辨测量的腔的动态显示多个稳定状态。理论很好地描述了这种行为。我们的结果可以被认为是一个初步的步骤，证明动态卡西米尔效应。
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.