报告题目：Quantized Attosecond Science: Merging High Harmonic Generation with Quantum Optics and Information
报告人： Oren Cohen, Israel Institute of Technology
报告时间：10月9日（周四）上午10:00
报告地点：教2-327会议室
主办单位：南京邮电大学理学院
邀请人： 吕衍凤教授
报告内容：
High Harmonic Generation (HHG) is the cornerstone of attosecond science, yet it is traditionally modelled as a closed quantum system driven by a classical laser field. This paradigm overlooks the rich open-system dynamics that emerge when the electron, the pump field, and the harmonic emission become strongly correlated across many unobserved degrees of freedom. By treating the electron—with its myriad coupling channels—and the light fields as dynamical quantum participants, we can reframe HHG through the lens of quantum optics and quantum information science (QIS).I will first review the historical transition of HHG from a semi-classical phenomenon toward a fully quantized framework, highlighting key theoretical and experimental milestones. I will then present our work on driving HHG with quantum light, exploring how non-classical states such as bright squeezed vacuum allow us to resolve quantum fluctuations on attosecond timescales through in-situ quantum tomography of the interaction. Finally, I will introduce Attosecond Path Qubits and show how HHG provides a unique platform for exploring decoherence at the atomic and attosecond scales.
报告人简介：
Oren Cohen is a Reba May & Robert D. Blum professor at the Department of Physics, Technion, Israel and head of the physics department in Guangdong Technion, China. He completed his PhD at the Technion in 2004 on optical spatial solitons and shifted to ultrafast optics during his post-doc period in JILA, university of Colorado at Boulder.His scientific discoveries include: the discoveries of incoherent solitons in lattices and in non-instantaneous nonlinear media during his PhD, his proposal and experimental demonstration of all-optical quasi-phase matching of high harmonic generation during his post-doctoral period, and as PI, the development and applications of the first scheme for generation of bright high-order harmonics with fully controlled polarization, the proposal and demonstration of the first technique for experimental demonstration of 3D spatiotemporal solitons in homogeneous media, the proposal and development of time-resolved imaging by multiplexed ptychography (TIMP) for ultrahigh-speed microscopy, the development of the most general formalism for selection rules in nonlinear optics and its use for new methods for diagnostics of chirality, and the proposal and first demonstration of high harmonic generation driven by quantum light.
Oren Cohen received several awards and fellowships, including the Horev fellowship for Leaders in Science and Technology program at the Technion (2009-2011), the 2011 Wolf Foundation Krill Prize for Excellence in Scientific Research, the 2013 and 2020 Hershel Rich Technion Innovation award, the 2015 Henry Taub prize for academic excellence, and ERC consolidator grant (2019). In 2022 he was elected to Optica society (formally OSA) fellow For important contributions in nonlinear optics, including generation and applications of circularly-polarized high-order harmonics and observation of 3D spatio-temporal solitons.