Fundamental quantum limits for detecting ultrahigh frequency gravitational waves
Abstract
The ultrahigh-frequency (above 10 kHz) gravitational waves (GW) window provides a unique opportunity to detect primordial GWs, free from astrophysical foregrounds that dominate lower frequencies. A stochastic GW background in this range is generically predicted from cosmological phase transitions and topological defects associated with grand unification and other ultra-high energy theories. We establish a universal quantum limit framework for various detection schemes, setting a fundamental bound on GW detectability. Our analysis reveals that backgrounds in the kHz-MHz range are in principle observable, whereas higher-frequency signals lie below the quantum limit. These results offer theoretical guidance for future detector designs and open new avenues for probing early universe physics.
Cite
@article{arxiv.2501.18146,
title = {Fundamental quantum limits for detecting ultrahigh frequency gravitational waves},
author = {Xinyao Guo and Haixing Miao and Zhi-Wei Wang and Huan Yang and Ye-Ling Zhou},
journal= {arXiv preprint arXiv:2501.18146},
year = {2026}
}
Comments
21 pages, 5 figures