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Q: Fachverband Quantenoptik und Photonik
Q 67: Poster – Quantum Information
Q 67.27: Poster
Thursday, March 5, 2026, 17:00–19:00, Philo 2. OG
Non-Exponential Decay in Finite Photonic Waveguide Arrays — •Florian Huber1,2,3,4, Benedikt Braumandl1,2,3,5, Johannes Knörzer6, Jonas Himmel7, Carlotta Versmold1,2,3, Robert Jonsson8, Alexander Szameit7, and Jasmin Meinecke1,2,3,4 — 1Ludwig-Maximilians-Universität München — 2Max-Planck Institut für Quantenoptik — 3Munich Center for Quantum Science and Technology (MCQST) — 4Technische Universität Berlin — 5Technische Universität München — 6ETH Zurich — 7Universität Rostock — 8Malmö University
Tight-binding models with a single defect at the edge of a lattice give rise to a variety of dynamical behaviors and provide a well controlled minimal setting to study decay in open quantum systems. Transitioning between exponential decay, non-exponential relaxation or oscillatory dynamics is possible by only varying a single parameter. To explore these effects experimentally, we use fused silica waveguide arrays providing a versatile yet well controllable platform and a natural realization of tight-binding models with varying coupling strengths and boundary conditions. To analyze the suitability of the experimental platform we characterize the waveguide arrays in detail and use the reconstructed refractive index profile for additional numerical eigenmode-expansion simulations. By comparing the analytic solution to our experimental data and additional numerical simulations and by taking finite-size effects into account we establish a general framework and benchmark for assessing how waveguide-based quantum simulator implementations can reliably emulate infinite or semi-infinite models.
Keywords: Waveguide Arrays; Open Quantum Systems; Quantum Simulation; Weak Coupling; Tight Binding