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Near-ultimate quantum-enhanced sensitivity in dissipative critical sensing with partial access

Dingwei Zhao1,*, Abolfazl Bayat1,2,3,†, and Victor Montenegro4,1,2,‡

  • *Contact author: 202311210340@std.uestc.edu.cn
  • †Contact author: abolfazl.bayat@uestc.edu.cn
  • ‡Contact author: victor.montenegro@ku.ac.ae
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Phys. Rev. Research 8, 023241 – Published 2 June, 2026

DOI: https://doi.org/10.1103/4lww-zml9

Abstract

Quantum sensors are powerful devices that exploit quantum effects to detect minute quantities with extremely high precision. Two obstacles to harnessing the full capacity of quantum probes are the resource-intensive preparation of the probe and the need for sophisticated measurements that typically require full access to the entire probe. Here, we address these challenges by investigating the driven Jaynes-Cummings system undergoing a dissipative quantum phase transition as a quantum sensor. We show that detuning the system off resonance significantly improves sensing performance by adequately selecting a preferred bistable state in phase space. Our dissipative sensor, independent of the initial probe preparation, exhibits sensitivity that scales faster than linearly with respect to an effective thermodynamic resource—the strong-coupling regime ratio—for appropriate choices of parameters, and this enhanced scaling manifests in both the full system and the field subsystem. Hence, quantum-enhanced sensitivity persists even when only partial system accessibility is available. Remarkably, we show that a homodyne detection of the field state, combined with Bayesian estimation, nearly saturates the ultimate sensitivity limit of the entire system.

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Phys. Rev. Research 8, 023241– Published 2 June, 2026
  • Received 27 August 2025
  • Revised 23 October 2025
  • Accepted 25 April 2026
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