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摘要:
量子噪声是影响激光干涉引力波探测能力的主要噪声之一。为应对量子噪声，进一步提高探测灵敏度，本文应用量子传递函数方法对传统迈克尔逊干涉仪的量子噪声源头进行了重新推导。结果表明，对于辐射压噪声和散粒噪声这两类量子噪声，前者可直接归因于干涉仪暗口处真空涨落的正交振幅涨落，后者则仅在一定条件下可完全归因于暗口处的正交相位涨落。在明确量子噪声的源头归属前提下，压缩光技术可提高探测器的灵敏度，但当采取不等臂干涉探测方案时，必须注意两不等臂臂长之间的长度差异。本文也提及了在空间引力波探测中推广应用压缩光技术时需要注意的问题，包括弱光锁相放大技术的影响、不同干涉仪间的联系、数据后处理的影响以及压缩光的产生。
Abstract:Quantum noise is one of the main noises affecting the detection of laser interference gravitational waves. To cope with quantum noise and further improve detection sensitivity, this paper applies the quantum transfer function method to rederive the source attribution of quantum noise in convention Michelson interferometers. The findings reveal that for two types of quantum noise-radiation pressure noise and shot noise-radiation pressure noise can be directly attributed to the amplitude quadrature fluctuations of vacuum fluctuations at the unused port of the interferometer, while shot noise can be completely attributed to the phase quadrature fluctuations at the unused port only under certain conditions. Provided that the source attribution of the quantum noise is clearly known, the squeezed light technique can improve the sensitivity of detectors. However, when adopting unequal arm interference detection schemes, attention must be paid to the length difference between the two unequal arm lengths. Finally, this article also mentions the issues that may need to be considered when promoting the application of squeezed light technology in space gravitational wave detection, including the impact of weak light lock-in amplification technology, the relationship between different interferometers, the impact of data post-processing, and the generation of squeezed light.
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Key words:
- gravitational wave detection /
- quantum noise /
- vacuum fluctuation /
- squeezed light
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