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Updated: Jun 21, 2025

Ultrafast Time-resolved Near-IR Stimulated Raman Measurements of Functional π-conjugate Systems
Published on: February 10, 2020
Entangled photons enabled ultrafast stimulated Raman spectroscopy for molecular dynamics
Jiahao Joel Fan1, Zhe-Yu Ou2, Zhedong Zhang3,4
1Department of Physics, City University of Hong Kong, Kowloon, Hong Kong SAR, China.
Abstract:
Quantum entanglement has emerged as a great resource for studying the interactions between molecules and radiation. We propose a new scheme of stimulated Raman scattering with entangled photons. A quantum ultrafast Raman spectroscopy is developed for condensed-phase molecules, to monitor the exciton populations and coherences. Analytic results are obtained, showing an entanglement-enabled time-frequency scale not attainable by classical light. The Raman signal presents an unprecedented selectivity of molecular correlation functions, as a result of the Hong-Ou-Mandel interference. Our work suggests a new paradigm of using an unconventional interferometer as part of spectroscopy, with the potential to unveil advanced information about complex materials.
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