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Q: Fachverband Quantenoptik und Photonik
Q 69: Collective Effects and Disordered Systems
Q 69.4: Vortrag
Freitag, 6. März 2026, 11:45–12:00, P 2
Motion-induced unidirectionality of collective emission in a non-chiral waveguide — •Yoan Spahn1, Benedikt Saalfrank1, Jens Hartmann2, Michael Fleischhauer2, Thomas Halfmann1, and Thorsten Peters1 — 1Institut für angewandte Physik TU Darmstadt — 2Theoretical Quantum Optics Group, RPTU Kaiserslautern
We report the first observation of motion-induced unidirectionality in the collective emission of atoms confined within a hollow-core waveguide. Although the coupling of individual atoms to the guided radiation field is isotropic in forward and backward direction, we observe a pronounced directional suppression of superfluorescent burstsof up to 95% by tuning of the characteristic collective decay rate. Corroborated by numerical simulations based on the truncated Wigner approximation (TWA) and a simple model including location blur, we 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. Furthermore, we study the two-time, 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.
Keywords: Collective Scattering; Waveguide; Unidirectionality; Correlations