标题： 一种速度敏感的音频带量子非破坏性干涉仪的控制 显示英文标题

标题： Control of a velocity-sensitive audio-band quantum non-demolition interferometer

摘要： 萨格纳克速度计干涉仪的拓扑结构有可能在音频频段内相对于等效的迈克尔逊干涉仪提供增强的引力波灵敏度。 萨格纳克速度计干涉仪的一个挑战来自低频区域固有的灵敏度不足，此时与信号相关的速度比例信号小于信号检测相关的噪声。 以格拉斯哥正在进行的概念验证萨格纳克速度计实验为例，我们量化了该问题，并提出了一种提取小位移比例信号的解决方案。 这种位移信号可以与现有的速度信号结合，以提高低频灵敏度，我们推导出适用于不同信号强度的最优滤波器来实现这一点。 我们表明，为了低频控制目的而提取位移信号的操作不会显著降低此类干涉仪的量子非破坏特性。 显示英文摘要

摘要： The Sagnac speed meter interferometer topology can potentially provide enhanced sensitivity to gravitational waves in the audio-band compared to equivalent Michelson interferometers. A challenge with the Sagnac speed meter interferometer arises from the intrinsic lack of sensitivity at low frequencies where the velocity-proportional signal is smaller than the noise associated with the sensing of the signal. Using as an example the on-going proof-of-concept Sagnac speed meter experiment in Glasgow, we quantify the problem and present a solution involving the extraction of a small displacement-proportional signal. This displacement signal can be combined with the existing velocity signal to enhance low frequency sensitivity, and we derive optimal filters to accomplish this for different signal strengths. We show that the extraction of the displacement signal for low frequency control purposes can be performed without reducing significantly the quantum non-demolition character of this type of interferometer.