Near-Ultimate Quantum-Enhanced Sensitivity in Dissipative Critical Sensing with Partial Access

• URL: http://arxiv.org/abs/2508.19606v1
• Date: Wed, 27 Aug 2025 06:43:04 GMT
• Title: Near-Ultimate Quantum-Enhanced Sensitivity in Dissipative Critical Sensing with Partial Access
• Authors: Dingwei Zhao, Abolfazl Bayat, Victor Montenegro,
• Abstract summary: Two obstacles to harnessing the full capacity of quantum probes are the resource-intensive preparation of the probe and the need for sophisticated measurements.<n>We investigate the driven Jaynes-Cummings system undergoing a dissipative quantum phase transition as a quantum sensor.<n>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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• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• 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 a super-linear enhancement in sensitivity with respect to a specific sensing resource -- the strong-coupling regime ratio -- which manifests in both the full system and partial 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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