Squeezing enhanced sensing at an exceptional point

• URL: http://arxiv.org/abs/2507.17961v1
• Date: Wed, 23 Jul 2025 22:06:35 GMT
• Title: Squeezing enhanced sensing at an exceptional point
• Authors: Changqing Wang, Deyuan Hu, Silvia Zorzetti, Anna Grassellino, Alexander Romanenko, Zheshen Zhang,
• Abstract summary: We find extraordinary enhancement of sensitivity by unifying both effects in a general framework for quantum sensing in open systems.<n>The result generalizes to multimode squeezed-state sensors with higher-order exceptional points catered to various quantum sensing platforms.
• Score: 37.69303106863453
• License: http://creativecommons.org/licenses/by/4.0/
• 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.

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