Regensburg 2025 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 11: Superconductivity: Poster

TT 11.53: Poster

Monday, March 17, 2025, 15:00–18:00, P4

Simulation of Non-Markovian Waveguide QED Systems with Tensor-Network Techniques — •Ze Xu — Walther-Meißner-Institute

The coupling of atoms or other two-level emitters to the quantized electromagnetic field is typically modeled using a Markovian master equation, which accounts for both dissipative and coherent photon-mediated interactions. However, this description breaks down in extended optical networks or slow-light waveguides, where significant propagation delays lead to strongly retarded, i.e., non-Markovian, interactions between the emitters. This regime of light-matter interactions remains largely unexplored due to the complexity of modeling non-Markovian effects in a fully quantized framework. In this poster, I will discuss the application of tensor-network techniques for simulating non-Markovian waveguide QED systems with strongly driven emitters, focusing specifically on the case of so-called giant atoms under critical coupling conditions.

Keywords: non-Markovian; waveguide-QED; tensor-network; giant atoms; strongly driven emitters