Mainz 2026 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 28: Poster – Quantum Optics
Q 28.26: Poster
Tuesday, March 3, 2026, 17:00–19:00, Philo 2. OG
Tomographic reconstruction of free-electron quantum states — •Hao Jeng1,2 and Claus Ropers1,2 — 1Department of Ultrafast Dynamics, Max Planck Institute for Multidisciplinary Sciences, D-37077 Göttingen, Germany — 2IV. Physical Institute, University of Göttingen, D-37077 Göttingen, Germany
Quantum state tomography is a fundamental and essential technique in every branch of quantum optics, this being true also for the newly emerging field of free-electron quantum optics. In this contribution, we describe several algorithms for reconstructing quantum states of swift electrons, using maximum likelihood estimation, Bayesian inversion, and deep learning. We apply these algorithms to experimental data previously recorded for an attosecond electron pulse-train to retrieve the density matrix and to analyse its physical properties. Based on the reconstructed quantum state, we obtain pulse-durations of about 245as and predict a degree of coherence of 36 per cent for radiations and excitations produced by these electrons.
Keywords: quantum state tomography; free-electron quantum optics; bayesian inversion; neural network; attosecond pulse-train