We demonstrate a single-mode nonlinear optical resonator for exceptional sensing in noisy environments. The signal based on the resonator’s dynamic hysteresis displays a square-root singularity, enhancing the sensitivity, precision and the signal’s information content.

Interacting Photons

Peters, K., & Rodriguez, S. (2022). Exceptional Precision of a Nonlinear Optical Sensor at a Square-Root Singularity. In Optica Advanced Photonics Congress 2022, Technical Digest Series. doi:10.1364/NP.2022.NpTu4F.3