Hannover 2020 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 38: Quantum Effects (QED) I
Q 38.2: Talk
Wednesday, March 11, 2020, 14:15–14:30, f442
Quantum and classical phase-space dynamics of a free-electron laser — •C. Moritz Carmesin1,2, Peter Kling2,3, Enno Giese2, Roland Sauerbrey2, and Wolfgang P. Schleich2,3 — 1Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany — 2Institut für Quantenphysik and Center for Integrated Quantum Science and Technology (IQST), Universität Ulm, 89069 Ulm, Germany — 3Institute of Quantum Technologies, German Aerospace Center (DLR), Söflinger Straße 100, D-89077 Ulm, Germany
In a quantum mechanical description of the free-electron laser (FEL) the electrons jump on discrete momentum ladders [1], while they follow continuous trajectories inside a separatrix in phase space according to the classical description. We show that it is not sufficient to have many momentum levels involved in order to observe the transition from quantum to classical dynamics. Only if additionally the initial momentum spread of the electron beam is larger than the quantum mechanical recoil caused by the emission and absorption of photons, the quantum dynamics in phase space resembles the classical one. Beyond these criteria, quantum signatures of averaged quantities like the FEL gain might be washed out. Our results [2] are not limited to the highly relativistic electron energies of FELs but are also applicable to different setups with electron-light interaction at lower electron energies.
[1] P. Kling et al. 2015 New J. Phys. 17 123019
[2] C. M. Carmesin et al. arXiv 1911.12584