from 27.05.2022 (Friday) to 29.05.2022 (Sunday)

BCGS Weekend Seminar

at Bad Honnef, Germany

We welcome all Master and Ph.D. students from Bonn and Cologne to join the retreat at Bad Honnef for a weekend seminar and participate in interesting talks on varied fields in Physics. Costs of lodging and food are covered by the Bonn-Cologne Graduate School. Participation is according to 3G rules (Vaccinated or recovered or rapid test). Please scroll down for more information on seminars.

Day 1 (27.05.2022)

15:30 - 16:00


16:00 - 19:00

Tea break (17:15 - 17:45)

A1. Nathan Lacroix, Markus Müller [Quantum Error Correction]

Nathan Lacroix (Quantum Devices Lab, ETH Zurich) -

Prof. Markus Müller (Theoretical Quantum Technology Group, RWTH Aachen and Forschungszentrum Jülich) -`

Correcting Errors in Quantum Computers - from Fundamental Concepts to the Research Frontier

Quantum computers hold the promise to speed up the solution of some of the most challenging computational problems, such as simulating the physics of many-body systems or factoring large numbers. At the same time, existing quantum devices are also notoriously susceptible to noise. In this interactive seminar, we will first provide you with an introduction to quantum computation and its applications. You will then learn and familiarise yourself with some fundamental concepts that allow one to protect quantum computers from noise: here, you will identify errors in a quantum computer yourself, design basic quantum circuits and study how errors propagate through them. We will then take you on a tour to the research frontier of real-world quantum computing and error correction based on superconducting and trapped-ion quantum computers. We will explain most recent breakthroughs such as the first error-corrected quantum memories and fault-tolerant quantum gates, and discuss current challenges towards developing large-scale error-corrected quantum computers.

A2. Berenike Maier [Physics of Bacterial Systems]

How can we use concepts from physics to understand biological systems? In this workshop we will focus on the topic of bacterial multicellularity. Bacteria are single cellular organisms. However, multicellular interactions enable them to defend themselves against external stresses including antibiotics, the immune system, or predators. Using tools from nanotechnology, we investigate how bacteria control attractive forces that govern the formation, dynamics, and structure of bacterial aggregates called biofilms. We aim at linking the underlying physical interactions to antibiotic tolerance observed in biofilms. Bacteria also interact by exchanging genes in a process called horizontal gene transfer. By experimental evolution and high-throughout technology, we investigate the role of gene transfer in adaptive evolution.

A3. Johann Kroha [Condensed Matter]

Time-resolved THz spectroscopy of many-body electron systems and what we learn from it:In novel time-resolved terahertz (THz) spectroscopy, a strongly interacting electron system responds to an incident, ultrashort THz pulse by a time-delayed echo pulse, whose delay time, duration and strength bear detailed information on quantum phase transitions in such systems.

19:00 - 21:00


21:00 - 22:00

  • Information on events on next days

  • Powerpoint Kareoke

Day 2 (28.05.2022)

07:30 - 09:00


09:00 - 12:00

Tea break (10:15 - 10:45)

B1. Nele Callebaut [Black holes and Holography] - Heraeus Lecture Hall (Ground floor)

I will give an introduction to black hole thermodynamics and to the concept of holography. Hawking's discovery that black holes radiate at a certain temperature allowed to talk about 'thermodynamics' of black holes. This discussion lead to fundamental new ideas on the nature of gravity, in particular the conjectured holographic nature of it. Holography is a popular approach to quantum gravity, in which a theory of gravity can be described by a lower-dimensional boundary theory that itself has no gravity. The most concrete known example of a holographic model is the AdS/CFT correspondence

B2. Thomas Reiprich

[eROSITA's 7 eyes on dark side of the universe] - Lecture Hall MHS (First floor)

In this talk, I’ll discuss how the X-ray space telescope eROSITA is shedding light on dark matter, dark energy, and missing baryons.

B3. Jochen Dingfelder [From pixels detectors to physics with Higgs bosons] - SR 01 (Ground floor)

In this lecture, we will first talk about silicon detector needed for precise measurements close to the interaction point of particle colliders. We will then discuss measurements with Higgs bosons as well as searches for new physics, in particular in final states with third generation particles (tau leptons, b quarks) at ATLAS and Belle II.

12:00 - 14:00


14:00 - 17:00

C1. Hiking in Siebengebirge

C2. Markus Röllig [Data Analysis Workshop]

Machine Learning in Natural Language Processing

We will discuss some concrete applications of neural networks and machine learning in the field of Natural Language Processing, such as word vector encoding and its applications. In this workshop we will have an initial lecture followed by a hands-on python exercise/workshop session for the attendants. Beginners in python AND/OR machine learning can get their feet wet with neural network programming and more experienced users can explore into text analysis, sentiment analysis etc.

BYOL: Bring your own laptop.

18:00 - 19:00

D1. Rolf Loschek [Physics & Industry] Heraeus Lecture Hall (Ground floor)

  • Physicists in management and business consulting

  • Self-employed business consulting

  • Research management

19:00 - 21:00


Day 3 (29.05.2022)

07:30 - 09:00

Breakfast + Checkout! (Keys given back at the reception and luggage can be put in the 'Luggage room' in the ground floor)

09:00 - 12:00

Tea break (10:15 - 10:45)

E1. Juliusz Doboszewski [Philosophy of black hole astrophysics] Heraeus Lecture Hall (Ground floor)

This talk will cover main themes in philosophical analysis of black holes. First, I will summarize epistemic situation we find ourselves in astronomy, and relate that to the current best evidence for the existence of black holes. Second, I will define interesting properties of some black hole spacetimes (indeterminism, hypercomputation, time machines), and discuss whether we might expect that these properties occur within our universe. Finally, I will briefly introduce some of the roles black holes and paradoxes associated with them play in the search for a theory of quantum gravity.

E2. Holger Grüll [Experimental Imaging and Image-guided Therapy] (Cancelled)

E3. Sebastian Hofferberth [Nonlinear Quantum Optics] SR 01 (Ground floor)

I will talk about the novel field of nonlinear quantum optics, which enables controlled interaction between individual photons

12:00 - 14:00

Lunch and Departure

Physikzentrum Bad Honnef (DPG)Hauptstraße 5, 53604 Bad Honnef


Uni Cologne

Mark - xgoh[at]

Nikkin - ndevaraj[at]


Uni Bonn

Alireza - aghababaei[at]

Armin - s6arafsh[at]

Pagnolia - s6kkpana[at]