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Squeezing-Enhanced Sensing at an Exceptional Point.

Changqing Wang¹, Deyuan Hu², Silvia Zorzetti¹

¹Fermi National Accelerator Laboratory (FNAL), Superconducting Quantum Materials and Systems Center, Batavia, Illinois 60510, USA.

Physical Review Letters

|July 10, 2026

Summary

This summary is machine-generated.

Researchers unified quantum squeezing and non-Hermitian degeneracies to dramatically boost measurement precision. This breakthrough enhances sensitivity in quantum sensing, offering a quartic scaling with perturbation strength.

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Area of Science:

Quantum physics
Metrology and measurement science
Quantum sensing

Background:

Achieving higher measurement precision is crucial for advancements in sensing and metrology.
Nonclassical resources like squeezing and non-Hermitian degeneracies offer distinct spectral responses for enhanced sensing.
The convergence of squeezing and non-Hermitian physics in quantum sensing remains a significant challenge.

Purpose of the Study:

To explore the unification of quantum squeezing and non-Hermitian degeneracies within a general framework for quantum sensing in open systems.
To investigate the potential for extraordinary enhancement of sensitivity by combining these two quantum phenomena.
To analyze the scaling of sensing precision with perturbation strength at critical points.

Main Methods:

Development of a general theoretical framework for quantum sensing in open systems.
Analysis of systems operating at the parametric oscillation threshold and an exceptional point.
Investigation of the spectral response and sensitivity scaling in the unified framework.
Generalization of the findings to multimode squeezed-state sensors and higher-order exceptional points.

Main Results:

Demonstration of extraordinary enhancement in sensing precision by unifying squeezing and non-Hermitian degeneracies.
Observation of a unique quartic scaling of sensing precision with perturbation strength at the parametric oscillation threshold and an exceptional point.
The proposed framework is applicable to various quantum sensing platforms.
The results generalize to more complex systems, including multimode squeezed-state sensors.

Conclusions:

The unification of quantum squeezing and non-Hermitian degeneracies provides a powerful approach to enhance quantum sensing capabilities.
The quartic scaling observed offers a significant advantage for precision measurements.
This work lays the foundation for developing next-generation quantum sensors with unprecedented sensitivity.