In non-degenerate SU(1,1) interferometers, beam splitters are replaced by two-mode squeezers, enabling sub-shot-noise sensitivity without input squeezing and robustness to detection losses by quantum entanglement. We propose a hybrid implementation in optomechanics where one "arm" is a mechanical mode undergoing two consecutive, mode-matched interactions with a traveling optical field (constituting the other arm). Such engineered interactions allow for sub-shot-noise phase detection even in the presence of mechanical thermal noise and optical losses, advancing precision interferometry in hybrid systems.
@article{arxiv.2509.22248,
title = {Hybrid SU(1,1) interferometry in optomechanics},
author = {Chao Meng and Emil Zeuthen and Polina R. Sharapova},
journal= {arXiv preprint arXiv:2509.22248},
year = {2025}
}
Comments
6 pages of main text + 18 pages of Supplementary Material, 6 figures