17. Quantum Chaos: Silvia Pappalardi

Jens Eisert joins ML4Q as a member for the next funding period which was granted around the time Chris and Mira recorded this Episode with him. So naturally, they discuss the German Excellence Initiative and how joining ML4Q was a natural step for Jens, given he has many previous and ongoing collaborations with other ML4Q members. Jens shares his insights on various aspects of quantum information processing such as benchmarking and no-go theorems, his recent white paper on AI and quantum computing, quantum error correction, complexity and pseudo chaos. Ultimately Jens makes a convincing case that quantum computers remain fascinating "even if you confine yourself to saying things that are true". He reflects on the unwritten rules of academia, teaching and inspiring students, and his approach to finding research topics by looking for "cultural gaps" between fields.

In this episode of ML4Q&A, host Mira Sharma, an associated member of the Matter and Light for Quantum Computing (ML4Q) Cluster, chats with one of the leading voices in experimental quantum optics - Professor Christine Silberhorn from the University of Paderborn. Christine’s groundbreaking work in integrated quantum optical systems has earned her numerous prestigious awards. She’s also a member of the Academy of Sciences and Arts of North Rhine-Westphalia and was appointed to the German Science Council in 2023. Her research focuses on making photonic quantum computing scalable and practical - using light particles, or "flying qubits," to push the boundaries of quantum communication. In this conversation, Christine shares how photonic quantum systems can be integrated on a chip, why education in quantum science needs fresh thinking as well as her personal journey in academia and research.

In this episode of ML4Q&A, Chris and Mira talk with Alex Altland, theoretical physicist and ML4Q member, about the tension between deep scientific thinking and the administrative reality of coordinating the renewal proposal of ML4Q. As one of the designated spokespersons for ML4Q’s next funding phase, Alex shares behind-the-scenes insights into managing this large-scale effort — just days before the final decision in May 2025. We also explore his enduring fascination with foundational concepts in physics, spanning quantum field theory, quantum chaos, and topological matter. Alongside his research, Alex reflects on the importance of conceptual clarity in teaching, textbook writing, and his path from chemistry (and a brief detour into business consulting) to becoming a deeply theoretical physicist.

In this episode of ML4Q&A, Chris and Mira are joined by ML4Q Professor Mario Berta, who shares his unique journey from ETH Zürich via Imperial College London and Amazon Web Services to RWTH Aachen University. They discuss his work on quantum algorithms, benchmarking, and bridging the gap between theory and industry, as well as insights into starting a research group and teaching theoretical physics. Tune in to explore Mario’s fascinating career path and hear about the quantum version of Stein’s Lemma!

In this special 20th episode of ML4Q&A, Chris and Mira celebrate the journey of the podcast, from its beginnings in 2021 to becoming a platform for exploring quantum careers, research, and innovation. This milestone episode dives into the interplay between academia and industry in quantum technology with two distinguished guests: Jan Goetz, CEO and co-founder of IQM, and ML4Q Member, Frank Wilhelm-Mauch, researcher at Forschungszentrum Jülich and co-founder of Qruise. Together, they discuss the complementary roles of academia and industry in advancing quantum technology, shedding light on Europe’s pivotal role in the global quantum landscape. Join us as we look back, celebrate the present, and dive into the future of quantum!

In this episode, Mira and Chris speak to Sebastian Hofferberth about his journey through academia as he literally went from Heidelberg to Harvard, to Stuttgart, then Denmark and finally to Bonn where he became member of ML4Q. We talk about the challenges of this nomadic lifestyle, which almost every longtime academic faces. Of course, Sebastian also explains his work in quantum optics with Rydberg atoms and shares his passion for teaching. He discusses how quantum mechanics (can be) seems non-intuitive at first but can be made more approachable.

In this episode, Mira and Chris talk with Markus Müller, a member of ML4Q and Professor at RWTH Aachen University and Forschungszentrum Jülich. Markus, an expert in quantum error correction, explains its importance in building large-scale quantum computers. He has supported pioneering logical qubit experiments on various platforms, including ion traps and superconducting qubits. They also discuss his recent work on avoiding mid-circuit measurements, a technique that benefits certain architectures and chip designs.

In this episode Mira and Chris talk to Silvia Pappalardi, who joined ML4Q as a junior professor last April. Silvia heads the Qhaos group (spelled with a Q) and introduces our listeners to the topic of quantum chaos which might be a bit intimidating for many of us. So, join Chris and Mira as they get some intuitive explanations from Silvia about concepts like thermalization and ergodicity and understand how these concepts relate to entanglement.

In this episode Chris introduces Mira Sharma, his co-host of the show. Mira is a PhD student at IQI in David DiVincenzo's group. This is their first co-hosted episode, so it is an experiment. For today’s episode Chris and Mira left the cluster bubble on a roadtrip to Siegen where they met Christof Wunderlich. Before recording, they were able to visit Christof's lab where it was fascinating to see the ion traps and have an interactive introduction to trapped ion QC. They also visited EleQtron, Germany’s first QC start-up.

In this episode Chris talks to Gláucia Murta, a postdoc in ML4Q, who was won the cluster's Young Investigator Award. They talk about Gláucia’s passion for fundamental questions, device independence and a great outreach project, the podcast O Q Quantico she just launched in her home country, Brazil.