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 dB, 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.
@article{arxiv.2408.10607,
title = {Generation of squeezed vacuum state in the millihertz frequency band},
author = {Li Gao and Li-ang Zheng and Bo Lu and Shaoping Shi and Long Tian and Yaohui Zheng},
journal= {arXiv preprint arXiv:2408.10607},
year = {2024}
}
Comments
17 pages,4 figures,1 table and 50 Refs. To be published in Light: Science & Applications