报告题目：Ultrafast Photoelectron Interferometry with Polychromatic Laser Fields

报告人：David Busto,  Assistant Professor at Lund University

报告人简介：

David Busto completed his undergraduate studies at Aix-Marseille University and Paris-Saclay University in France before obtaining his PhD from Lund University in 2020 under the supervision of Prof. Anne L'Huillier. His doctoral research focused on photoionization dynamics in rare gases using attosecond photoelectron interferometry. In 2020, he was awarded the Oscar II Prize for the best PhD thesis in the Faculty of Engineering.

In 2021, he joined the group of Prof. Giuseppe Sansone at the University of Freiburg, Germany, supported by a postdoctoral fellowship from the Swedish Research Council. There, he studied photoionization dynamics in small molecules, with a particular focus on the role of nuclear motion and photoelectron coherence in photoionization dynamics. At the same time, he collaborated with Hugo Laurell at Lund University on the development of photoelectron quantum state tomography.

David returned to Lund University in 2023 to continue his research on quantum aspects of atomic and molecular photoionization. Since 2024, he is an Assistant Professor at Lund University and a Fellow of the Wallenberg Centre for Quantum Technology (WACQT), where he leads a research group working on ultrafast quantum metrology.

摘要：

The photoelectric effect is a fundamental quantum phenomenon that is used in various spectroscopy and microscopy techniques. When ultrashort extreme ultraviolet pulses are used to initiate this process, the emitted photoelectron is described by a quantum mechanical wavepacket that can be coherently manipulated using infrared fields, forming the basis of ultrafast photoelectron interferometry.

Photoelectron interferometry is one of the pillars of attosecond science, enabling the temporal characterization of attosecond pulse trains and the measurement of photoionization dynamics. So far, most interferometric schemes employ an attosecond pulse train and an infrared pulse with a broad, continuous spectrum. In this talk, I will discuss how more advanced schemes using spectrally tailored infrared laser fields open new opportunities with applications ranging from quantum state tomography of photoelectrons to fundamental tests of quantum mechanics. In particular, I will introduce the KRAKEN scheme, which uses tunable bichromatic IR fields the measure the photoelectron quantum state, I will present its extension to poly-chromatic fields, and I will discuss the possibility to implement a non-linear version of Sorkin’s test of quantum mechanics using photoelectron interferometry.  

报告时间：2026年7月14日 13:30（星期二）
报告地点：生命科学楼504会议室
主办单位：原子与分子物理研究所