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.

Latest News

The European UVQuanT project has officially started! This week's kick-off meeting in Berlin will see a gathering of all partners, as well es guests from academia and industry alike. The goal of this 4-year project is an improvement in the reliability of UV lasers and optics, with a focus on the wavelength range between 200 and 230 nm.

Congratulations to Lara Becker and Marc Vöhringer Carrera for having submitted their master theses! Lara worked on the setup of a calcium beam clock, while Marc worked on spectroscopy of Zinc using transitions deep in the ultraviolet. Good luck for your next career steps!

The beginning of the winter term often marks the beginning of a bachelor or master thesis. This year, three students join the group: Lukas Möller (who already did his summer internship with us) will do his master thesis work on the Calcium project, Julian Spanier will do his bachelor thesis in the gyroscope project, and Mahdi Razavi Tabar will start his bachelor thesis on quantum frequency conversion.

Frequency conversion often employs a nonlinear crystal, especially if it comes to conversion processes at the single-photon level. However, crystals come with a certain set of material properties, some of which are good (e.g. large nonlinearities) and some of which are bad (e.g. absorption and phase matching conditions). As an alternative approach, we employ a dense gas of diatomic molecules (hydrogen in this case) as the nonlinear medium. We demonstrate frequency upconversion, downconversion, and show that polarization is conserved: check out the manuscript on the arXiv here.

Since a couple of weeks, the state of NRW has its new state government (Landesregierung). Today, the new minister for culture and science (MKW), Mrs Ina Brandes, paid her inaugural visit to the University of Bonn to learn about our various excellence initiatives. Simon Stellmer gave a brief introduction to our beloved research topics... optical clocks, gyroscopes, quantum computing, and so forth. We are looking forward to jointly promote research and science in NRW! See the press release here.

We are hiring! Currently, we can offer three PhD positions with our mercury and zinc projects. The mercury project is our oldest and largest experiment, devoted to searches for physics beyond the standard model with ultracold mercury atoms, with a side project on quantum simulation. This project is funded through the ERC, the SFB OSCAR, and the EU project UVQuanT. Within the zinc project, we will develop a novel optical clock based on zinc, and aim to study entanglement and decoherence processes of single atoms trapped in optical tweezers. This project is funded through various DFG grants and is part of the ML4Q Cluster of Excellence. For all of these positions, some experience in a cold atom or laser lab is certainly a bonus. Please enquire with Prof. Stellmer.


Prof. Dr. Simon Stellmer

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