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, as well as 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.
Fields of Study & Subjects
Photonic and Optical Devices
Sensor Technology and Measurement Systems
Advanced MEMS and NEMS Technologies
Publication details
- Journal / source
- Physical Review Letters
- Publisher
- American Physical Society (APS)
- Volume
- 136
- Issue
- 25
- Pages
- 250801–250801
- Publication date
- 16 April 2026
- Language
- EN