近日，山西大学的郑耀辉&史少平及其研究团队取得一项新进展。他们实现了毫赫兹频段中压缩真空态的生成。相关研究成果已于2024年10月17日在国际知名学术期刊《光：科学与应用》上发表。

据悉，引力波的探测开启了观测宇宙的新纪元。量子资源优势显著提升了引力波观测站的灵敏度。尽管地面引力波探测中的压缩态已备受关注，但适用于中低频探测的压缩态生成仍属未开垦领域。

为填补超低频率下压缩态光场的空白，该研究团队报道了首次直接观测到的压缩真空场，其傅里叶频率低至4毫赫兹，量子噪声降低可达8.0分贝，这是通过采用多重噪声抑制方案实现的。这项研究工作为未来引力波观测站提供了量子资源，促进了量子精密测量技术的发展。

附：英文原文

Title: Generation of squeezed vacuum state in the millihertz frequency band

Author: Gao, Li, Zheng, Li-ang, Lu, Bo, Shi, Shaoping, Tian, Long, Zheng, Yaohui

Issue&Volume: 2024-10-17

Abstract: The detection of gravitational waves has ushered in a new era of observing the universe. Quantum resource advantages offer significant enhancements to the sensitivity of gravitational wave observatories. While squeezed states for ground-based gravitational wave detection have received marked attention, the generation of squeezed states suitable for mid-to-low-frequency detection has remained unexplored. To address the gap in squeezed state optical fields at ultra-low frequencies, we report on the first direct observation of a squeezed vacuum field until Fourier frequency of 4 millihertz with the quantum noise reduction of up to 8.0dB, by the employment of a multiple noise suppression scheme. Our work provides quantum resources for future gravitational wave observatories, facilitating the development of quantum precision measurement.

DOI: 10.1038/s41377-024-01606-y

Source: https://www.nature.com/articles/s41377-024-01606-y