$10^{-11}$ rad级微波相位检测
Microwave Phase Detection at the Level of $10^{-11}$ rad
摘要：
我们报告的噪声测量系统具有最高的光谱分辨率以往任何时候都取得了在微波域。它能够在几个$kHz$以上的傅立叶频率处检测$2\times10^{-11} rad/\sqrt{Hz}$的$rms$幅度的相位波动。这样的精度允许研究各种微波元件和材料中的固有波动，以及基础物理的精确测试。采用这个系统，我们发现了一个以前未知的现象下变频泵振荡器的相位噪声到低频电压波动。
英文摘要：
We report on a noise measurement system with the highest spectral resolution ever achieved in the microwave domain. It is capable of detecting the phase fluctuations of $rms$ amplitude of $2\times10^{-11} rad/\sqrt{Hz}$ at Fourier frequencies above few $kHz$. Such precision allows the study of intrinsic fluctuations in various microwave components and materials, as well as precise tests of fundamental physics. Employing this system we discovered a previously unknown phenomenon of down-conversion of pump oscillator phase noise into the low-frequency voltage fluctuations.
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