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  • Open Access

Squeezing-Enhanced Sensing at an Exceptional Point

Changqing Wang1,*, Deyuan Hu2, Silvia Zorzetti1, Anna Grassellino1, Alexander Romanenko1, and Zheshen Zhang2,†

  • *Contact author: cqwang@fnal.gov
  • †Contact author: zszh@umich.edu
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Phys. Rev. Lett. 136, 250801 – Published 23 June, 2026

DOI: https://doi.org/10.1103/kmtx-7x9d

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.

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Phys. Rev. Lett. 136, 250801– Published 23 June, 2026
  • Received 23 July 2025
  • Accepted 16 April 2026
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