论文标题
控制一个连贯的控制边带的滤波器的控制
Control of a filter cavity with coherent control sidebands
论文作者
论文摘要
为了减少重力波检测器的宽带量子噪声，使用滤光片实现的频率依赖性挤压真空状态是一种成熟的技术，将在第四个观察运行中实现在高级Ligo和高级处女座中。为了获得频率依赖性挤压的益处，必须准确控制相对于挤压真空状态的滤波器腔的引导和比对。为此，我们建议使用已用于控制挤压角的连贯的控制边带，建议一种新的长度和对齐控制方案。由于两个挤压真空状态和相干控制边带具有相同的模式匹配条件，并且几乎相同的频率，因此可以通过此方案准确控制滤波器腔的失谐和对齐。在本文中，我们显示了该方案的原理及其在重力波检测器中的应用。
For broadband quantum noise reduction of gravitational-wave detectors, frequency-dependent squeezed vacuum states realized using a filter cavity is a mature technique and will be implemented in Advanced LIGO and Advanced Virgo from the fourth observation run. To obtain the benefit of frequency-dependent squeezing, detuning and alignment of the filter cavity with respect to squeezed vacuum states must be controlled accurately. To this purpose, we suggest a new length and alignment control scheme, using coherent control sidebands which are already used to control the squeezing angle. Since both squeezed vacuum states and coherent control sidebands have the same mode matching conditions and almost the same frequency, detuning and alignment of the filter cavity can be controlled accurately with this scheme. In this paper, we show the principle of this scheme and its application to a gravitational-wave detector.
