Quantum 2025 – wissenschaftliches Programm
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TUE: Tuesday Contributed Sessions
TUE 1: QIP Implementations: Photons III
TUE 1.5: Vortrag
Dienstag, 9. September 2025, 15:15–15:30, ZHG001
Experimental quantum metrology for fast-varying systems — •Lukas Rückle1,2 and Stefanie Barz1,2 — 1Institute for Functional Matter and Quantum Technologies, Universitity of Stuttgart, 70569 Stuttgart, Germany — 2Center for Integrated Quantum Science and Technology (IQST), Universitity of Stuttgart, 70569 Stuttgart, Germany
The use of quantum states for metrology tasks has been proven to surpass classical limits on the precision of estimating parameters. Recently, the framework of probably approximate correct (PAC) metrology has been introduced. It not only enables the estimation of a parameter in an arbitrarily big parameter space without prior knowledge, but also gives bounds for few- and single-shot metrology settings. It thus bridges the rather theoretical case of performing infinitely many measurements and practical metrology tasks.
Here, we present experimental results in a photonic metrology setting. We show how to use different states and measurements and how for each case to optimize the prediction strategy of the parameter that shall be estimated. Our work shows how to implement the given new framework of PAC metrology and thus helps improving the precision of applications that only allow for a few measurements, e.g. when measuring fast varying systems.
Keywords: photonic quantum metrology; probably approximate correct metrology; quantum optics