Squeezing enhanced sensing at an exceptional point
Abstract
Pushing the boundaries of measurement precision is central for sensing and metrology, pursued by nonclassical resources such as squeezing, and non-Hermitian degeneracies with distinct spectral response. Their convergence, however, remains challenging. We find extraordinary enhancement of sensitivity by unifying both effects in a general framework for quantum sensing in open systems. At the parametric oscillation threshold and an exceptional point, the sensing precision exhibits a unique quartic scaling with the perturbation strength. The result generalizes to multimode squeezed-state sensors with higher-order exceptional points catered to various quantum sensing platforms.
Cite
@article{arxiv.2507.17961,
title = {Squeezing enhanced sensing at an exceptional point},
author = {Changqing Wang and Deyuan Hu and Silvia Zorzetti and Anna Grassellino and Alexander Romanenko and Zheshen Zhang},
journal= {arXiv preprint arXiv:2507.17961},
year = {2026}
}
Comments
Version accepted for publication in Physical Review Letters. 3 figures in the main text, 4 figures in the Supplemental Material