Dear friends, A quick reminder that Félix's talk is tomorrow at 10:00. Here is the link for those attending online: meet.jit.si/cqi-demon-M6QW9V7YY Warm regards, Will Schober ________________________________ From: william.schober(a)usi.ch <william.schober(a)usi.ch&gt; Sent: Wednesday, November 26, 2025 11:28 AM To: seminar-cqi(a)lists.usi.ch <seminar-cqi(a)lists.usi.ch&gt; Subject: [seminar-cqi] CQI Seminar: Félix Thouin Dear friends, Next Thursday, the 4th of December at 10:00 in D5.01 we'll have a talk by Félix Thouin from the Université de Montréal, title and abstract below. Hope to see you there, Will Schober Title: Towards a quantum information perspective on multidimensional spectroscopy Abstract: Multidimensional spectroscopy refers to an ensemble of experimental techniques that probe the coherent non-linear response of matter to a sequence of optical electromagnetic pulses. By analyzing this response, it is possible to infer the quantum dynamics of excited states. Great technological advances in ultrafast pulse generation, manipulation and detection have made these experiments more accessible than ever but their interpretation remains a fantastic challenge. To leverage the full potential of these techniques in condensed matter physics, we seek to develop an algorithmic understanding of the effect of a sequence of pulses on matter. In this presentation, I will share with you the status of this quest. After introducing the technique, a pedestrian stroll through the formalism of how light interacts with matter will take us right into Liouville space. There, perturbation theory will surprise us with non-completely positive or trace preserving operations despite being very real and physical processes. From there, I hope to gain insights by discussing the road ahead with you all.