Bonn 2025 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 62: Poster – Quantum Information Technologies (joint session Q/QI)

Q 62.38: Poster

Thursday, March 13, 2025, 17:00–19:00, Tent

Sparse Optimization of Two-Dimensional Terahertz Spectroscopy — •zhengjun wang — University of Hamburg Institute for Quantum Physics Luruper Chaussee 149 22761 Hamburg

two-dimensional terahertz spectroscopy (2DTS) is a low-frequency analogue of two-dimensional optical spectroscopy that is rapidly maturing as a probe of a wide variety of condensed matter systems. However, a persistent problem of 2DTS is the long experimental acquisition times, preventing its broader adoption. A potential solution, requiring no increase in experimental complexity, is signal reconstruction via compressive sensing. In this work, we apply the sparse exponential mode analysis (SEMA) technique to 2DTS of a cuprate superconductor. We benchmark the performance of the algorithm in reconstructing the terahertz nonlinearities and find that SEMA reproduces the asymmetric photon echo lineshapes with as low as a 10

Keywords: compressive sensing theory; Quantum Materials; multidimensional spectroscopy