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QI: Fachverband Quanteninformation
QI 36: Poster – Quantum Information (joint session QI/Q)
QI 36.31: Poster
Donnerstag, 13. März 2025, 17:00–19:00, Tent
Metrology for magnetic moments in transmission electron microscopes — •Michael Gaida1, Santiago Beltran Romero2,3, Stefan Nimmrichter1, Dennis Rätzel4, and Philipp Haslinger2,3 — 1Universität Siegen, Adolf-Reichwein-Straße 2a, 57076 Siegen, Deutschland — 2Atominstitut, TU Wien, Stadionallee 2, 1020 Vienna, Austria — 3University Service Centre for Transmission Electron Microscopy, TU Wien, Wiedner Hauptstraße 8-10/E057-02, 1040 Wien, Austria — 4ZARM, Unversität Bremen, Am Fallturm 2, 28359 Bremen, Germany
In transmission electron microscopy (TEM), an electron beam passes through a thin sample layer, producing an interference pattern that reveals atomic-scale structures. While TEM is well-established, quantum metrology offers potential enhancements. Building on the experimental proposal in reference [1], which aims to detect individual quantum spins' magnetic moments using electron beams, we extend the analysis to include scattering dynamics in the paraxial high-energy regime. We calculate the quantum Fisher information for estimating magnetic moments using analytical and numerical methods, comparing it to classical methods with position-resolving electron detectors. Our goal is to determine the experimental conditions required to detect a single Bohr magneton with focused electron beams.
[1]P. Haslinger, S. Nimmrichter, and D. Rätzel, Spin resonance spectroscopy with an electron microscope, QST 9, 035051 (2024).
Keywords: Electron microscopes; Metrology; Magnetic moments