Mainz 2026 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 43: Poster – Quantum Systems
Q 43.11: Poster
Mittwoch, 4. März 2026, 17:00–19:00, Philo 2. OG
Simulation of motion-induced unidirectional collective emission with the Truncated Wigner Approximation — •Jens Hartmann1, Yoan Spahn2, Benedikt Saalfrank2, Thorsten Peters2, and Michael Fleischhauer1 — 1RPTU Kaiserslautern-Landau, Kaiserslautern, Germany — 2TU Darmstadt, Darmstadt, Germany
We discuss the first observation of motion-induced unidirectionality in the collective emission of atoms confined within a hollow-core waveguide. To understand the underlying effect we use the Truncated Wigner Approximation for spins [1, 2] to simulate the collective emission of an effective number of moving atoms coupled to a waveguide. We see good agreement between experimental results and the theoretical description and can show that this behaviour arises because the decay occurs via a Raman-process-based effective two-level system with a spatially-dependent phase of the transition dipole moment. We derive a simple effective model of static emitters that includes positional uncertainty and leads to an effective non-isotropic collective coupling. Furthermore, we study the second-order correlation function of the emitted light close to and well above the threshold to collective emission, showing a buildup of coherence during the superfluorescent bursts while the emitted light below the threshold exhibits thermal statistics.
[1, 2] C. Mink et al., 10.21468/SciPostPhys.15.6.233, PhysRevRe- search.4.043136
Keywords: Truncated Wigner Approximation; collective emission; Waveguide; superradiance