Enhanced sensitivity of the LIGO gravitational wave detector by using squeezed states of light
Enhanced sensitivity of the LIGO gravitational wave detector by using squeezed states of light
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DOI：
10.1038/nphoton.2013.177
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发表时间：
2013-08-01
期刊：
影响因子：
35
通讯作者：
Zweizig, J.
中科院分区：
文献类型：
--
作者：
Aasi, J.;Abadie, J.;Zweizig, J.
在爱因斯坦首次预测引力波存在的近世纪后，一个全球性的地球引力波观测站网络（1-4）正在寻求使用精密激光干涉测量法直接探测这种微弱的辐射。由于光的量子性质，光子散粒噪声对用于此任务的三倍尺度迈克尔逊干涉仪的attometer级灵敏度施加了基本限制。在这里，我们注入压缩态，以提高激光干涉仪引力波天文台（LIGO）的探测器之一的性能超过量子噪声限制，最显着的是在频率区域下降到150赫兹，几个天体物理源至关重要，在任何频率下观察到的性能没有恶化。通过注入压缩态，LIGO探测器表现出了有史以来对引力波的最佳宽带灵敏度，这对以前所未有的灵敏度观察引力波宇宙具有重要意义。
Nearly a century after Einstein first predicted the existence of gravitational waves, a global network of Earth-based gravitational wave observatories(1-4) is seeking to directly detect this faint radiation using precision laser interferometry. Photon shot noise, due to the quantum nature of light, imposes a fundamental limit on the attometre-level sensitivity of the kilometre-scale Michelson interferometers deployed for this task. Here, we inject squeezed states to improve the performance of one of the detectors of the Laser Interferometer Gravitational-Wave Observatory (LIGO) beyond the quantum noise limit, most notably in the frequency region down to 150 Hz, critically important for several astrophysical sources, with no deterioration of performance observed at any frequency. With the injection of squeezed states, this LIGO detector demonstrated the best broadband sensitivity to gravitational waves ever achieved, with important implications for observing the gravitational-wave Universe with unprecedented sensitivity.