【講座題目】Attosecond Quantum Optics and Tortured Super-Radiance
【主 講 人】Misha Ivanov 教授
【講座時間】2026年4月2日15:00-17:00
【講座地點】教1樓14階梯教室
【主講人簡介】
Misha Ivanov，歐洲科學(xué)院院士，德國柏林馬克斯·玻恩非線性光學(xué)研究所理論部主任，柏林洪堡大學(xué)物理系教授。Ivanov教授是超快強場物理與阿秒物理領(lǐng)域的國際領(lǐng)軍學(xué)者，在物理學(xué)領(lǐng)域的杰出貢獻獲得了多個權(quán)威獎項的認可，包括2003年由加拿大皇家學(xué)會頒發(fā)的Rutherford Medal in Physics和2004年由亞歷山大?馮?洪堡基金會頒發(fā)的Friedrich Wilhelm Bessel Award，2022年被選為歐洲科學(xué)院院士。Mikhail Ivanov教授在極端非線性光學(xué)、阿秒與強場物理、量子控制、二維和強關(guān)聯(lián)材料中的超快動力學(xué)以及化學(xué)物理等領(lǐng)域中取得了眾多引領(lǐng)性研究成果，極大推動了現(xiàn)代物理學(xué)的發(fā)展。在國際知名學(xué)術(shù)期刊上發(fā)表論文230余篇（其中Science、Nature、Physical Review Letters、Rev. Mod. Phys、Nature與Science子刊 近100篇），總被引用超過37,500次，H指數(shù)（Hirsch index）為80。
【講座內(nèi)容簡介】
The last few years have seen a revolution in our understanding of attosecond nonlinear optics such as high harmonic generation: we have started to appreciate that highly non-equilibrium quantum dynamics of matter can endow its nonlinear optical response with distinct quantum properties.
I will present some of our latest results describing how quantum dynamics of even simple material systems, from a two-level system to an atom to a small molecule, can be tailored to generate quantum states of light. In small molecules, the interplay of ultrafast electronic excitation and nuclear dynamics can be used to make and break a Schr?dinger cat. Turning to atomic gases, one can take advantage of the strong classical driving field to generate multiple excitations, setting up conditions for Dicke super-radiance. What would happen if these atoms are placed inside a cavity which is far detuned from the atomic line? The atoms are now strongly discouraged from emitting the frequencies they normally do, while being constantly excited by a strong classical field. We find that when placed inside such a torture chamber, the atoms form strongly correlated many-body state that tunes its energy to the cavity resonance. The released super-radiance then develops distinctly quantum properties leading to the generation of a multi-mode squeezed state. Time resolving the generated emission clearly shows how the atomic ensemble undergoes a phase transition from many uncorrelated, even if phase-locked, excitations to a correlated many-body state.