Many groups around the world share the enthusiasm for our work. We are grateful to be able to collaborate with them.

Collaborators on the ultracold mercury EDM project

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© University of Amsterdam

Florian Schreck’s group at the University of Amsterdam. Florian pioneered work on quantum-degenerate alkaline-earth elements and is currently pushing for quantum simulation and sensing applications. We collaborate on the refinement of cooling and manipulation techniques, see for more of their recent work.

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Atsushi Yamaguchi, senior researcher in the group of Prof. Katori at RIKEN, Japan, is one of the world’s experts in the development of novel types of clocks, e.g. Hg lattice clocks, Cd lattice clocks, and the Th-229 nuclear clock. He is currently leading the efforts to develop a Cd lattice clocks, which bears many similarities to our work on Hg. We collaborate on the development of cooling schemes and of VUV lasers.

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© University of Delaware

Marianna Safronova’s group at the University of Delaware is among the world’s experts for the theory behind novel optical clocks, precision measurements, and beyond-standard-model physics. They beautifully complement our experimental work with theory input.

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Toptica Photonics AG is one of the world’s leading companies in the development of diode lasers (and related devices) for research, to say the least. Many of the people at Toptica, among them Jürgen Stuhler (Senior Director Quantum technologies) are recruited directly from leading quantum optics labs, which makes this a very unique company to collaborate with. Here, we seek to develop and improve UV lasers at 185 and 254 nm. Webpage:

Collaborators on the clock project


We work closely together with the Max-Planck-Institute for Radio Astronomy, also based in Bonn, on clocks and synchronization.

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© nuClock

Prof. Stellmer acted as scientific coordinator of the nuClock project ( before moving to Bonn. The collaboration on the development of novel optical clocks continues.

Local collaborators

 We work closely together with the other quantum optics groups in Bonn:

Funding agencies

We acknowledge generous funding from the following institutions and agencies:

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© University of Bonn

Start-up funding is provided through the University of Bonn and the Institute of Physics.

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 The mercury project is funded through an ERC Starting Grant entitled “Ultracold mercury for a measurement of the EDM” by the European Union.

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© SFB/TR 185

 Our work is generously supported by the SFB/TR 185, a collaboration between the universities of Bonn and Kaiserslautern.

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© ML4Q

The developent of optical technologies is done within the Cluster of Excellence ML4Q, a collaboration between Aachen, Cologne, Bonn, and Jülich.

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The optical clock project is supported by the Deutsche Forschungsgemeinschaft (DFG).

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