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Chinese Science Bulletin (Chinese Version)

Quantum metrology in gravitational wave detection

Yiqiu Ma

Published May 1, 2026• 0 citations

Abstract

引力波探测对精密测量科学提出了极限挑战。1960年代末，Vladimir B. Braginsky发现量子力学定律对探测器灵敏度设定了一个基本极限。这一发现不仅催生了量子测量理论，也实际指导了后续的探测器设计。当前量子精密测量技术已经帮助Advanced LIGO探测器提高了宽频灵敏度。未来的地基引力波探测装置，如爱因斯坦望远镜和宇宙探索者，其更高的灵敏度要求意味着必须进一步压低量子噪声。发展量子精密测量科学，进一步调控干涉仪中光场与检验质量的相互作用以压低量子噪声，已成为当前和未来探测器研发工作的重点。值得一提的是，这些达到量子噪声极限的激光干涉仪，其价值并不仅限于引力波观测。作为一类典型的量子光力系统，它们为探索宏观尺度量子效应、检验引力量子性等研究提供了有希望的实验平台，也为暗物质探测等基础物理问题的实验研究开辟了新的技术路径。本文将聚焦于地基激光干涉引力波探测器中量子噪声的产生机制，讨论量子极限的概念及其主要突破方法，并介绍相关量子精密测量技术在其他基础物理领域中的应用。

DOI: 10.1360/csb-2026-0318

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引力波探测对精密测量科学提出了极限挑战。1960年代末，Vladimir B. Braginsky发现量子力学定律对探测器灵敏度设定了一个基本极限。这一发现不仅催生了量子测量理论，也实际指导了后续的探测器设计。当前量子精密测量技术已经帮助Advanced LIGO探测器提高了宽频灵敏度。未来的地基引力波探测装置，如爱因斯坦望远镜和宇宙探索者，其更高的灵敏度要求意味着必须进一步压低量子噪声。发展量子精密测量科学，进一步调控干涉仪中光场与检验质量的相互作用以压低量子噪声，已成为当前和未来探测器研发工作的重点。值得一提的是，这些达到量子噪声极限的激光干涉仪，其价值并不仅限于引力波观测。作为一类典型的量子光力系统，它们为探索宏观尺度量子效应、检验引力量子性等研究提供了有希望的实验平台，也为暗物质探测等基础物理问题的实验研究开辟了新的技术路径。本文将聚焦于地基激光干涉引力波探测器中量子噪声的产生机制，讨论量子极限的概念及其主要突破方法，并介绍相关量子精密测量技术在其他基础物理领域中的应用。

光谱测量与成像技术的进步，已成为生命科学与材料科学研究中的关键表征手段。然而，在针对光学响应微弱的样品（如低维材料、活体细胞等）进行实际观测时，高功率激发光往往引入显著经典噪声，并造成不可忽视的光致损伤，从而限制了光学测量的信噪比与应用范围。在此背景下，具备特殊量子统计特性的非经典光源（如纠缠光与压缩光）为实现超越经典极限的信噪比提升提供了极具潜力的解决方案。本文聚焦于量子增强光谱与成像领域，系统梳理了基于纠缠光与压缩光两类重要量子光源的最新研究进展。纠缠光凭借光子间的量子关联特性，在关联成像、非探测光子成像及超快干涉测量等应用中展现出卓越的抗噪声能力；而压缩光则通过压缩光场噪声，在位移传感、等离激元探测及非线性显微成像等方面显著提升了探测灵敏度与信噪比。本文进一步系统阐述了量子光源在提高信噪比、降低光致损伤、提升时间分辨率以及增强非线性转换效率等方面的独特优势，并分析了当前制约量子成像技术实用化的关键挑战，包括光源亮度低，系统损耗大等问题。最后，对该领域未来的发展方向进行了展望。

The 2015 seminal discovery of gravitational waves (GW) from the collision of the binary black holes has boosted interest to development of a more sensitive next generation gravitational-wave interferometers. As the current Advanced LIGO and Virgo detectors are limited by fundamental quantum fluctuations of light in the most of their detection band, the next generation of interferometers must use advanced quantum noise-mitigation methods and quantum non-demolition (QND) techniques to achieve the planned design sensitivity of 10 times better than the current detectors have. In this paper, we attempt to give an overview of some advanced quantum metrology techniques being considered as potential sensitivity boosters for the next generation GW detectors.

This study explores the integration of quantum algorithms, specifically Grover's algorithm, with quantum metrology to enhance the efficiency and sensitivity of gravitational-wave detection. By combining quantum matched filtering with precise parameter estimation techniques, the research aims to optimize sensor networks for the identification of gravitational waves. This integrated approach leverages the strengths of quantum superposition and entanglement to improve signal detection, reduce noise, and strategically place sensors. The findings demonstrate significant improvements in the sensitivity and accuracy of gravitational wave measurements, highlighting the potential of quantum technologies to revolutionize observational astronomy and enhance our understanding of the universe.

Abstract An interesting proposal for detecting gravitational waves involves quantum metrology of Bose–Einstein condensates (BECs). We consider a forced modulation of the speed of sound of a BEC, whose modulation frequency matches that of an incoming continuous gravitational wave. The speed of sound modulation induces parametric resonance in the BEC, which in turn enhances sensitivity of the BEC to gravitational waves. We find that such a BEC detector could potentially be used to detect gravitational waves across several orders of magnitude in frequency, with the sensitivity depending on the speed of sound, size of the condensate, and frequency of the phonons. We discuss the sensitivity of a possible BEC experiment and comment on the current technological limitations. We also comment on the noise sources as well as what is necessary for such a detector to become feasible.