Quantum expander for gravitational-wave observatories
Quantum expander for gravitational-wave observatories
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DOI：
10.1038/s41377-019-0230-2
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发表时间：
2019-03
期刊：
影响因子：
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通讯作者：
M. Korobko;Yiqiu Ma;Yanbei Chen;R. Schnabel
中科院分区：
文献类型：
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作者：
M. Korobko;Yiqiu Ma;Yanbei Chen;R. Schnabel
激光的量子不确定性限制了引力波观测站的灵敏度。在过去的30年里，人们发明了压缩量子不确定性的技术，以及用光学谐振器增强引力波信号的技术。然而，谐振器的线宽有限，在天文物理学上高度有趣的致密双星合并过程中产生的高信号频率仍然无法解决。在这里，我们提出了一个纯粹的光学方法来扩展检测带宽。它在其中一个光学谐振腔中使用量子不确定性压缩，在保持低频灵敏度不变的情况下补偿有限谐振腔的线宽。这种量子扩展器的目的是提高未来引力波探测器的灵敏度，我们建议在其他腔增强的引力波实验中使用这种新工具。
The quantum uncertainty of laser light limits the sensitivity of gravitational-wave observatories. Over the past 30 years, techniques for squeezing the quantum uncertainty, as well as for enhancing gravitational-wave signals with optical resonators have been invented. Resonators, however, have finite linewidths, and the high signal frequencies that are produced during the highly scientifically interesting ring-down of astrophysical compact-binary mergers still cannot be resolved. Here, we propose a purely optical approach for expanding the detection bandwidth. It uses quantum uncertainty squeezing inside one of the optical resonators, compensating for the finite resonators’ linewidths while keeping the low-frequency sensitivity unchanged. This quantum expander is intended to enhance the sensitivity of future gravitational-wave detectors, and we suggest the use of this new tool in other cavity-enhanced metrological experiments.