Enhancing information retrieval in quantum-optical critical systems via quantum measurement backaction

• URL: http://arxiv.org/abs/2511.22248v1
• Date: Thu, 27 Nov 2025 09:19:32 GMT
• Title: Enhancing information retrieval in quantum-optical critical systems via quantum measurement backaction
• Authors: Cheng Zhang, Mauro Cirio, Xin-Qi Li, Pengfei Liang,
• Abstract summary: We present a sensing protocol tailored for open quantum-optical sensors that exhibit dissipative criticality.<n>We identify a performance sweet spot, near which the ultimate precision limit can be efficiently approached.<n>Our protocol establishes a new pathway towards quantum-enhanced precision in open quantum-optical setups.
• Score: 8.49151848213283
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Continuous monitoring of open quantum-optical systems offers a promising route towards quantum-enhanced estimation precision. In such continuous-measurement-based sensing protocols, the ultimate precision limit is dictated, through the quantum Cramér-Rao bound, by the global quantum Fisher information associated with the joint system-environment state. Reaching this limit with established continuous measurement techniques in quantum optics remains an outstanding challenge. Here we present a sensing protocol tailored for open quantum-optical sensors that exhibit dissipative criticality, enabling them to significantly narrow the gap to the ultimate precision limit. Our protocol leverages a previously unexplored interplay between the quantum criticality and the quantum measurement backaction inherent in continuous general-dyne detection. We identify a performance sweet spot, near which the ultimate precision limit can be efficiently approached. Our protocol establishes a new pathway towards quantum-enhanced precision in open quantum-optical setups and can be extended to other sensor designs featuring similar dissipative criticality.

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