Welcome to the webpage of the research group of Prof. Dr. Simon Stellmer.

"Quantum metrology": that's the art of measuring using phenomena from quantum physics. Specifically, we aim to increase measurement sensitivity beyond of what would be possible in classical systems, and we do this in an interdisciplinary approach.

Highlights
Simon Stellmer receives ERC Proof of Concept Grant2
Professor Simon Stellmer,  a member of the Cluster of Excellence ML4Q, receives a ‘Proof of Concept Grant’ from the European Research Council (ERC) for his project „GyroRevolutionPlus“. With the funding of €150,000 for up to 18 months, the physicist will continue to prepare his research results from previous ERC projects for commercial application. This is the second time that Professor Stellmer has been successful in this funding program after having received a grant for his previous project ‘GyroRevolution’ in 2023. The precision instruments he and his team are developing can be used to improve natural disaster early warning systems.
Joining the PanEDM collaboration3
Why does the Universe contain matter? And where did all that antimatter go? These very fundamental questions are related to massive CP violation, and miniscule charge deformations in elementary particles (called electric dipole moments, EDMs) might be an approach to shed some light on these mysteries.
Geodesy meets optics4
Rotation sensors come in all shapes and sizes, and they might find applications in various areas of the geosciences, including geodesy, seismology and exploration.
Inauguration of the ring laser gyroscopes5
Prof. Dr. Simon Stellmer's Quantum Metrology research group celebrates the inauguration of the ring laser experiments on Thursday, February 1 from 13:00.

Latest News

We'll have the DPG Spring Meeting6 coming up next week, with around 1600 AMO folks coming to Bonn. We will be contributing 6 talks and 7 posters, so watch out for the Quantum Metrology logo! We will offer lab tours on Tuesday, Wednesday, and Thursday at 2 pm and 5 pm, starting from the main entrance of the Physics Institute at Nussallee 12. Get in touch with us if you want to see the labs and learn more about our work. A big THANK YOU goes to Sebastian Hofferberth an his team for organizing the conference. 

In German, there is a saying "Am Aschermittwoch ist alles vorbei", which might be translated as "Everything ends on Ash Wednesday". Keeping with this saying, David Röser had his PhD defense today (Ash Wednesday!) to finish his PhD thesis not in ashes, but with a large celebration on a beautiful sunny day. The title of his thesis reads "Spectroscopy and the Path to Laser Cooling of Zinc", and David indeed developed a range of components and procedures that form the foundation of our Zinc experiment. Congratulations, Dr. Röser! 

Here it is: our first publication on ring laser technology7 has been published with Optics Letters! Jannik set up two schemes to lock the free spectral range of GeoRG, our largest ring laser with an arm length of 3.5 meters. A simple phase lock is sufficient to keep the perimeter length constant to within 5 nanometers.

The end of a busy week: Stefan Gessler finished and successfully defended his bachelor's thesis, congratulations! Thomas Gereons finished his internship, only to continue next week on his master's thesis project. Also, three 10th grade high school students spent the week with us: Marie, Karl, and Jonathan explored the capabilities of small Arduino boards, asking ChatGPT to generate the code required to drive small servo motors.

Anica went into mass production mode: while the previous paper has been published with Optics Letters8, the next one is already on the arXiv9. Both papers study frequency conversion in gas-filled hollow-core fibers in different regimes. Congratulations to Anica! 

With the help of Andreas Brotzer from LMU, we installed a state-of-the-art broadband seismometer in our basement. Side-by-side with our own narrowband seismometer, our tiltmeter, and the large ring laser, we embarked on a three-week measurement campaign during the Christmas break. Indeed, we were able to record a number of teleseismic events (= earthquakes on the other side of the globe) with magnitudes between M6.5 and M7. Thanks a lot to Andreas and the entire team at the Geodetic Observatory in Fürstenfeld-Bruck, as well as to Heiner Igel's group at LMU, for loan of the equipment and for support in data analysis. 

Happy New Year to all of you, hoping for a peaceful and successful year 2025! We are welcoming two new additions to the team: Thomas Gereons started his master internship with us, and Tessa Koch dived into her Bachelor's thesis: good luck to the two of you!

Ring lasers are interferometers that require length stability at a fraction of the wavelength: not a mean feat for heterolithic structures of more than 10 meter length, especially when operated in a wobbling University building with sizeable temperature fluctuations. In a new preprint10, Jannik Zenner presents two methods to stabilize the length of the 14-meter ring cavity to within a few nanometers. Congratulations to Jannik and the team! 

Contact

Prof. Dr. Simon Stellmer

Stellmer quMercury.jpg
© University of Bonn

E-Mail:

stellmer@uni-bonn.de

Tel:

+49 228 73 3720

Address:

Physikalisches Institut der Universität Bonn
Nussallee 12
53115 Bonn
Germany

Office:

Room 0.016 (ground floor), easiest access via Wegelerstraße 10

Labs:

U1.011 (basement), easiest access via Wegelerstraße 10

Wird geladen