Hybrid SU(1,1) Interferometry in Optomechanics
Phys. Rev. Lett. 136, 233602 – Published 11 June, 2026
DOI: https://doi.org/10.1103/t9tt-t5x2
Abstract
In nondegenerate 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.
