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MO: Fachverband Molekülphysik

MO 20: Poster – Molecular Spectroscopy and Dynamics

MO 20.23: Poster

Wednesday, March 12, 2025, 17:00–19:00, Tent

Quantum Light enabled Ultrafast Spectroscopy — •Jiahao Fan¹, Feihong Liu², Zhe-Yu Ou³, and Zhedong Zhang⁴ — ¹City University of Hong Kong — ²City University of Hong Kong — ³Department of Physics,City University of Hong Kong — ⁴Department of Physics,City University of Hong Kong

Classical light such as laser and thermal radiation has long been utilized for spectroscopy to explore material structures and dynamics. However, quantum states of light open new avenues for ultrafast optics and spectroscopy, by the variation of their unique properties,e.g., entanglement and photons statistics, after interacting with materials. Quantum light possesses unique characteristics that distinguish it from classical light, particularly the phase-space distribution which reflects its fundamental quantum statistics that may take advantage of noise-reduction. We focus on spectroscopic applications using entangled photons and squeezed light. The microscopic theory for the spectroscopy and corresponding signals induced by certain transition processes is developed. Nonlinear optical signals induced by entangled photons for the coherent anti-Stokes Raman spectra(CARS) and stimulated Raman spectra(SRS) are investigated. We further extend to the transient absorption process that enables real-time monitoring of the exciton transport in the transition metal dichalcogenides (TMDs). This series of works on nonlinear optical spectroscopy using quantum light explicitly demonstrates the quantum supremacy in ultrafast spectroscopy by jointly enhancing the time and energy scales beyond the classical limit.

Keywords: Ultrafast spectroscopy; Quantum light; Quantum entanglement; Excitonic dynamics