Bonn 2025 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 39: Photon BEC
Q 39.6: Vortrag
Mittwoch, 12. März 2025, 15:45–16:00, HS V
Observation of Coherent oscillations in lattices for photon condensates — •Peter Schnorrenberg1, Daniel Ehrmanntraut1, Nikolas Longen1, Purbita Kole1, Kevin Peters1, and Julian Schmitt1,2 — 1Universität Bonn, IAP, Wegelerstr. 8, 53115 Bonn — 2Universität Heidelberg, KIP, Im Neuenheimer Feld 227, 69120 Heidelberg
Exploring coherent dynamics of quantum gases trapped in periodic lattice potentials enables the microscopic study of fundamental phenomena, e.g., from condensed matter physics. Previous work with ultracold atoms or exciton-polaritons has focused on closed or far-from-equilibrium systems, respectively. Bose-Einstein condensates of photons in dye-filled microcavities, on the other hand, offer a new approach to access coherent dynamics of bosons in variable lattice potentials due to the possible coupling to the enviroment, e.g., from gain, loss, or reservoirs. Here we present measurements of the coherent dynamics of photon condensates trapped in periodic lattice potentials inside a dye-filled microcavity. By recording the time-resolved photon density, we observe Rabi oscillations in double well traps, which we validate by independent spectroscopic measurements, for variable tunneling rates. Moreover, we explore the emergence of Bloch oscillations in larger lattices, consisting of several sites. Our experimental scheme paves the way to investigate the crossover from coherent to incoherent dynamics in the presence of dephasing from reservoirs, which could provide new insights into quantum transport.
Keywords: Optical cavities; Bose-Einstein condensates; Photonics; Nanostructures; Open Quantum Systems