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Quantum technologies

Dieter Meschede's research group

Quantum technologies with single neutral atoms


Physik für Großeltern


Physik für Großeltern ....


Eine Vorlesung im Wintersemester 2022/23 ...

Dieter Meschede, Institut für Angewandte Physik, Universität Bonn


… für Großeltern? Vielleicht wollen Sie ja Ihren Enkeln

erklären können, wieso ein Flugzeug fliegen kann. Wie

sich die Planeten bewegen und was Exoplaneten sind.

Wie ein Laser funktioniert und was er kann. Was es mit

der Quantenwelt auf sich hat. Wie die Instrumente die

Töne erzeugen. Sie sind sich aber nicht sicher, was Sie

erzählen sollen …


Falls Sie Freude daran haben, solchen und andere Fragen des Alltags oder auch der reinen Neugier an der Physik nachzugehen, dann schließen Sie sich doch dieser Vorlesung an:

·       10 Vorlesungen im Wintersemester 2022/23

·       Jeweils 1,5 Stunden, mit viel Gespräch und Diskussion

·       Beginn: Do, 20.10.2022, 17:15 – 18:45

·       Ort: Wolfgang Paul-Hörsaal, Kreuzbergweg 28

·       Oder per Zoom-Link: Bei This e-mail address is being protected from spambots. You need JavaScript enabled to view it erfragen

·       Teilnahmevoraussetzungen: keine


Mehr Informationen unter dem Menu "Lehre" an der linken Seite, nachdem Sie sich eingeloggt haben


Für die Anmeldung, klicken Sie auf diesen Link.


Dieter Meschede's group finishes experimenting

Important note:

Due to the retirement of Prof. Meschede the laboratories of our research group have been closed.


  1. There are no new opportunities for thesis work at any level.
  2. We wish you good luck elsewhere.
  3. Continue following our activities on this website.

Clausius enthusiasm

Rudolph Clausius was born on 02.01.1822 and served as Professor of Physics at the University of Bonn from 1869 till his death in 1888. He is one of the most eminent scientists of the 19th century, his legacy includes the mechanical theory of heat, the invention of the entropy and much more with relevance to numerous fields of science.

The University of Bonn has commemorated his legacy with a series of lectures during the winter term 2021/22. For more information, including a lecture by Dieter Meschede, klick the image.


Quantum Technology Wanted: Passion for Precision

Dieter Meschede holds a seminar at the Institute of Physical and Theoretical Chemistry of the University of Bonn, giving an overview of the research activities of the group. The seminar can be viewed at this link.


Quantum System Pushed to its Speed Limit

Knowing how fast a quantum process can be reveals the ultimate limits to information processing. The brachistochrone problem for two-level quantum systems—the fastest path connecting two quantum states—has been long known. These solutions, however, are generally not applicable to larger quantum systems. In Phys. Rev. X 11, 011035 (2021), we experimentally demonstrate a shortest-duration quantum process that fundamentally cannot be reduced to two-level dynamics.

We carry out fast coherent transport of an atomic wave packet over a distance 15 times its size using an optical conveyor belt. Our measurements of the transport fidelity sharply resolve the transition from a quantum-controllable to a quantum-noncontrollable process as the time is shortened, thus revealing the existence of a minimum duration—a quantum speed limit. Based on a geometric approach to quantum state dynamics, we provide a close lower bound on the minimum process duration beyond the two-level-system paradigm.

These results shed light upon a fundamental speed limit of quantum state dynamics. Identifying quantum processes of the shortest duration is important in quantum sensing and quantum computing.

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