Universität Bonn

Nanophysics and Quantum Photonics

Nanophysics and Quantum Photonics

We are a newly established research group at the University of Bonn.

The research in our team is concerned with the interaction between light and matter at the nanoscopic and quantum level. In particular, we focus on understanding and controlling these interactions among single photons, atoms and molecules. We are interested in research questions such as how to control the quantum states of a molecule with photons, how to increase the efficiency of these interactions, and how the structural properties of molecules and light, such as their chirality (handedness), manifest themselves in these interactions. The knowledge gained through our research could enable the use of molecules for quantum technology and facilitate sensitive probes for molecular sensing in chemistry and biology.

News from our team
New semester -- New faces

We are delighted to welcome Delia, Kathrin, Theo, Hudson, and Hazem to our team.

Fang and Max join our team in Bonn from January 1st.

We are delighted to welcome Tianyu Fang and Max Masuhr to start in our team in Bonn.

Amplifying a zeptonewton force with a single ion

Nonlinear mechanical oscillators are ubiquitous in nature and widely used in technological applications. Driven nonlinear oscillators in the multistable regime are particularly interesting for applications such as force sensing, because small perturbations from a stable equilibrium can cause the oscillator to abruptly switch to other stable states.
In our recent work, we show that mechanical nonlinearity is readily obtained by confining a particle in a 3D funnel-shaped potential. The geometry-induced motional coupling introduces an intrinsic Duffing-type nonlinearity in the particle’s oscillation. Using a modified Paul trap, we realize such a potential for a single calcium ion. We observe bifurcation of the oscillator under strong driving and demonstrate the enhancement of a zeptonewton electrostatic force by a factor of 20.

Read the article at: https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.131.153601

Contact us

Daqing Wang

Institut für Angewandte Physik

Wegelerstr. 8

53115 Bonn

Email: daqing.wang@uni-bonn.de

Phone: +49 228 73 3508


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