Bonn 2025 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 26: Poster – Precision Measurement, Metrology, and Quantum Effects
Q 26.2: Poster
Tuesday, March 11, 2025, 14:00–16:00, Tent
Adiabatic Control of Photon Transport in Ring Geometries — •Milena Djatchkova1, Igor Lesanovsky1,2, and Beatriz Olmos Sanchez1,2 — 1Theoretische Physik, Universität Tübingen, Auf der Morgenstelle 14, 72076 Tübingen, Germany — 2School of Physics and Astronomy and Centre for the Mathematics and Theoretical Physics of Quantum Non-Equilibrium Systems, The University of Nottingham, Nottingham, NG7 2RD, United Kingdom
Dense atomic ensembles couple collectively to the electromagnetic field. This gives rise to interesting effects, like the well-known super- and subradiant emission of light from the ensemble and exchange long-ranged interactions. Previous studies have demonstrated that, in a ring of atoms, a single photon can be trapped for times that largely exceed the lifetime of an isolated excitation by harnessing the presence of a subradiant manifold of states and the angular dependence of the induced dipole-dipole interactions (e.g. [1]). Here, we show that the photon can furthermore be transported in a dispersionless way across the ring by adiabatically altering the orientation of the atomic transition dipole moments (via, e.g., the direction of an external magnetic field). Moreover, we go beyond the single-photon case and model the dynamics of two rings, each containing a single photon. Our results reveal that, as the distance between the rings decreases, the photons can be brought to interact with each other, leaving as a trace a phase imprinting on the photonic wave functions. [1] M.Cech, I.Lesanovsky, and B.Olmos, Dispersionless subradiant photon storage in one-dimensional emitter chains, Phys. Rev. A108,L051702 (2023).
Keywords: subradiance; dipole-dipole interactions; photon trapping