The goal of the group Applied Quantum Interactions (AQI) is the better understanding of quantum mechanical interactions in order to use them efficiently for applications.
The group is closely collaborating with the other groups of the Applied Quantum Systems department.

The AQI group is specialised in the investigation of colour centres in solids. Here, the nitrogen–vacancy (NV) centre in diamond is of particular interest.

Since the quantum mechanical state of an NV centre can be precisely manipulated, it can be used perfectly as a model system to explore quantum physical effects.

The focus of our group is to investigate the interaction between multiple NV centres as well as the interaction to other neighbouring electronic and nuclear spins.

For example, cross-relaxations between spins or Landau–Zener transitions in complex multi-level systems can be studied.

This knowledge can be used, among other things, for the generation of sensitive quantum sensors, for the optimisation of 'gates' in quantum computing, and for the preparation of non-thermodynamic states in magnetic resonance methods (NMR, EPR).

BSc/MSc Theses Topics

We offer a variety of BSc and MSc theses in our research field, such as:

  • Laser annealing of colour centres in diamond
  • Nuclear hyperpolarisation
  • Coupling of NV centres with their spin neighbourhood
  • Compact quantum field sensor
  • Hydrogen gathering in CVD diamonds.

If you are interested in a BSc or MSc thesis project, please directly contact Dr. Ralf Wunderlich with a short application including a letter of motivation and a CV. This helps us to find a research topic that matches your talents and interests.

Selected Publications

R. Wunderlich, J. Kohlrautz, B. Abel, J. Haase, J. Meijer.
Optically induced cross relaxation via nitrogen-related defects for bulk diamond 13-C hyperpolarization.
Phys. Rev. B 96, 220407(R) (2017).
DOI: 10.1103/PhysRevB.96.220407.

R. Wunderlich, R. Staacke, W. Knolle, B. Abel, J. Haase, J. Meijer.
Robust nuclear hyperpolarization driven by strongly coupled nitrogen vacancy centers.
J. Appl. Phys. 130, 104301 (2021).
DOI: 10.1063/5.0052790.

P. Räcke, L. Pietzonka, J. Meijer, D. Spemann, R. Wunderlich.
Vacancy diffusion and nitrogen-vacancy center formation near the diamond surface.
Appl. Phys. Lett. 118, 204003 (2021).
DOI: 10.1063/5.0046031.

Funding

DFG Projects

  • Investigation of Photo-luminescence of NV rich Diamonds for Understanding Interaction with paramagnetic Centers and for quantum based sensor applications
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  • (A)diabatic passages in solids for nuclear hyperpolarization and optimization on the model system nitrogen-vacancy centers in diamond
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  • Porous materials for pumping nuclear hyperpolarization of small molecules
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Team

Dr. Ralf Wunderlich

Dr. Ralf Wunderlich

Academic Staff

Linnéstraße 5, Room 484
04103 Leipzig

Phone: +49 341 97-32706

B. Sc. Alexius Enke

B. Sc. Alexius Enke

Master Student

Linnéstraße 5, Room 481
04103 Leipzig

Telephone: +49 341 97-32707

M. Sc. David Plotzki

M. Sc. David Plotzki

Research Fellow

Linnéstraße 5, Room 484
04103 Leipzig

Phone: +49 341 97-32711

 Arshdeep Sharma

Arshdeep Sharma

Research Fellow

Linnéstraße 5, Room 481
04103 Leipzig

Phone: +49 341 97-32707

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Markus Wunderlich

Bachelor Student

Linnéstraße 5, Room 484
04103 Leipzig

Telephone: +49 341 97-32711