腾讯会议：264-836-838，会议密码：260724

邀请人：汪非凡 副研究员

联系人：万 源 研究员 汪非凡 副研究员

田春璐 cltian@iphy.ac.cn

主办方：中国科学院物理研究所、松山湖材料实验室

报告人简介

Prof. Zhedong Zhang is now an Associate Professor at City University of Hong Kong. He obtained his Ph.D. in physics from Stony Brook University in 2016. Since then, he has been working as a postdoctoral fellow until 2020 when he moved to Hong Kong. He received the Robert Welch Postdoctoral Fellowship (Chemical Physics) in 2020. In 2024, he received the Excellent Young Scientists Award, NSFC (国家优秀青年科学基金).

Prof. Zhang’s research interest is the theoretical chemical physics, with two focuses: (1) Nonlinear optical spectroscopy with quantum light for ultrafast processes in molecules; (2) Mesoscopic quantum thermodynamics for systems driven far from equilibrium. He has more than 40 professional publications, on high-profile journals including Nature, Phys. Rev. Lett., Optica, J. Phys. Chem. Lett., etc.

报告摘要

Quantum-correlated photons, e.g., entanglement and squeezing, open up a new avenue for molecular spectroscopy, by using parameters of the quantum-light correlations as new control knobs. With recent advancements of quantum optical technologies, imaging and controlling the electron and phonon motions in a variety of molecules are achievable, towards unprecedented time-energy scales and precision that are not attainable by classical light. Two essential problems emerge thereby: 1. quantum-light interactions with molecules containing much richer degrees of freedom than atoms; 2. Quantum fluctuations. The underlying physics still remains elusive for molecular spectroscopy and metrology.

In this talk, I will present an overview of recent advancements on nonlinear optical spectroscopy for molecular relaxation dynamics, using quantum-correlated photons. This led to the engagement of the quantum optics with the ultrafast spectroscopy, which draw great attention recently. The entangled twin photons and squeezed light will be of the most interest, with a focus on the time-resolved scheme. The transient absorption and Raman spectra with quantum-correlated light are studied, where the microscopic models are developed for a real-time monitoring of electron dynamics. Our results reveal an incredible time-frequency resolution beyond the classical Fourier’ s limitations, which therefore presents a quantum supremacy in the ultrafast spectroscopy.