Freiburg 2024 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 42: Precision Measurements III (joint session Q/A)

A 42.7: Vortrag

Freitag, 15. März 2024, 16:00–16:15, HS 1221

Probe thermometry with continuous measurements — •Julia Boeyens¹, Björn Annby-Andersson², Pharnam Bakhshinezhad^2,3, Géraldine Haack⁴, Martí Perarnau-Llobet⁴, Stefan Nimmrichter¹, Patrick P. Potts⁵, and Mohammad Mehboudi^3,4 — ¹Naturwissenschaftlich-Technische Fakultät, Universität Siegen, Siegen 57068, Germany — ²Physics Department and NanoLund, Lund University, Box 118, 22100 Lund, Sweden — ³Technische Universität Wien, Stadionallee 2, 1020 Vienna, Austria — ⁴Département de Physique Appliquée, Université de Genève, 1211 Genève, Switzerland — ⁵Department of Physics, University of Basel and Swiss Nanoscience Institute, Klingelbergstrasse 82, 4056 Basel, Switzerland

Accurate thermometry plays a vital role in natural sciences. A well studied approach is to prepare a probe and allow it to interact with a thermal environment of unknown temperature for a fixed time before being measured. However, in some experimentally relevant settings, it is more practical to allow the probe to interact continuously with the environment. We consider a minimal model consisting of a two-level probe coupled to the thermal environment. Monitoring thermal transitions enables real-time estimation of temperature. We discuss adaptive and non-adaptive strategies. In particular, we evaluate the Fisher information for the trajectories of the probe and optimise according to this. Finally, we investigate the performance of the thermometer when the measurements made are subject to noise. This lays the foundation for experimentally realised real-time adaptive thermometry.

Keywords: adaptive Bayesian estimation; Noisy measurements; Thermometry