DOE OSTI · 2573813
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.
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Wang, Changqing [Fermilab] (ORCID:0000000198073045), Hu, Deyuan [U. Michigan, Ann Arbor] (ORCID:0009000983923217), Zorzetti, Silvia [Fermilab] (ORCID:0000000232083387), Grassellino, Anna [Fermilab] (ORCID:0000000239858296), Romanenko, Alexander [Fermilab] (ORCID:0000000313780870), Zhang, Zheshen [U. Michigan, Ann Arbor] (ORCID:0000000286688162). 2026-06-23. Squeezing-Enhanced Sensing at an Exceptional Point. https://doi.org/10.1103/kmtx-7x9d
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