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Prof. Dr. techn. Stefan Filipp

+49 89 289-14201
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Technical Physics
Job Title
Professorship on Technical Physics

Courses and Dates

Offered Bachelor’s or Master’s Theses Topics

Non-reciprocal devices for microwave signal routing

Breaking time-reversal symmetry by external magnetic fields leads to non-reciprocal behavior of microwave propagation that can be used for signal routing and isolation. In the context of superconducting qubits this becomes relevant to shield the qubits from incoming radiation along the readout path.
In this project you will gain an understanding of different types of circulators and isolators and evaluate high bandwidth realizations based on Josephson junction elements or novel materials, in which chiral edge plasmons or topological insulators could be used for non-reciprocal devices without external fields. In collaboration with the group of Prof. Knolle and the group of Prof. Holleitner we will explore a variety of different materials both from the theoretical and the experimental perspective. You will then test suitable realizations at cryogenic temperatures, study losses and reflection properties and investigate, how these devices can be integrated directly onto the  superconducting qubit chip.

suitable as
  • Master’s Thesis Condensed Matter Physics
Supervisor: Stefan Filipp
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