Bonn 2025 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 54: Quantum Sensing II (joint session Q/QI)

Q 54.1: Hauptvortrag

Donnerstag, 13. März 2025, 11:00–11:30, HS I PI

New Opportunities for Sensing via Continuous Measurement — •Dayou Yang, Susana F. Huelga, and Martin B. Plenio — Institute of Theoretical Physics, University of Ulm, Ulm, Germany

The continuous monitoring of driven-dissipative quantum optical systems provides key strategies for the implementation of quantum metrology, with prominent examples ranging from the gravitational wave detectors to the emergent driven-dissipative many-body sensors. Fundamental questions about the ultimate performance of such a class of sensors remain open---for example, how to perform the optimal continuous measurement to unlock their ultimate precision; how to effectively enhance their precision scaling towards the Heisenberg limit? In this talk I will present our recent theoretical efforts towards answering these questions. In the first part I will present a universal backaction evasion strategy for retrieving the full quantum Fisher information from the nonclassical, temporally correlated fields emitted by generic open quantum sensors, thereby to achieve their fundamental precision limit. In the second part I will introduce dissipative criticality as a resource for nonclassical precision scaling for continuously monitored open quantum sensors, by establishing universal scaling laws of the quantum Fisher information in terms of critical exponents of generic dissipative critical points.

Keywords: quantum sensing; quantum metrology; quantum measurement; quantum optics