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Quantum Optics and Fundamental Physics

Institute for Experimental Physics

In the teams of the institute, we work on experimental quantum optics an on quantum metrology, a subfield of quantum technology. We investigate how we can prepare atoms and molecules in special states, primarily by means of lasers, and how to use the particles for addressing questions in fundamental physics.

These include:

How do atoms interact in highly excited states?
How can molecules with extremely low kinetic energy be produced?
What is the nature of dark matter?
Are there other forces besides the four known forces of nature?
Are the established symmetries exactly or only approximately valid?

Answering these questions requires, in particular, developing and refining new experimental techniques.

2022/05: Michael Hansen passes the Ph.D. oral examination on the topic "Frequency metrology tools for high-precision spectroscopy of molecular hydrogen ions". It is the first live oral since the pandemy. Congratulations!

2022/05:  Team "Ion trap I" (S. Alighanbari, G. Giri, I. Kortunov, M. Schenkel, S. Schiller) is awarded this year's Helmholtz-Prize of the Helmholtz-Fonds during a celebration in Physikzentrum Bad Honnef. It was followed by a river trip on the ship "Moby Dick". The prize carries a 20.000 € cheque.

2021/12: R. Oswald, Victor Vogt and A. Nevsky set new limits for the interaction between dark matter and common matter.

2021/12: Doctoral student Rene Oswald and A. Nevsky demonstrate a novel spectroscopy technique for ions in solids.

2021/11: For the first time, a single molecular hydrogen ion is trapped and cooled in a controlled way in a radio-frequency trap (Christian Wellers, Magnus Schenkel et al.).

2021/08: Eugen Wiens graduates with a dissertation on cryogenic optical resonators. Congratulations!

2021/08: Doctoral student Ivan Kortunov discovers ultra-narrow infrared transitions in sympathetically cooled ions and realises a high-precision measurement of the proton-electron mass ratio.

2020/08: Soroosh Alighanbari obtains his Ph.D. degree summa cum laude.

2020/06:    D. Bakalov (INRNE, Sofia) and his team present, with our contribution, the accurate theory of the hyperfine structure of the deuterium molecular ion

2020/05:    We succeeded in performing the most precise determination of the proton-electron mass ratio by spectroscopy of HD+

2020/04:    E. Wiens presents the complete characterization of a compact, vibration-insensitive silicon resonator operated at 3 K

2019/05:   Interview with Prof. Schiller about the ERC project "PREMOL" (in German, starts at 1:50 min)

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