M.Sc. Franz Haslbeck
Courses and Dates
|Title and Module Assignment|
Exercise Physics with Neutrons 2
Assigned to modules:
Responsible/Coordination: Leitner, M.
|dates in groups|
Offered Bachelor’s or Master’s Theses Topics
- Fabrication of high-coherence superconducting qubits
- Over the last two decades the coherence time of superconducting qubits, a leading platform in quantum computing, could be improved by five orders of magnitude from several nanoseconds up to hundreds of microseconds. However, for practical quantum computers further improvements of the qubits are required. In this project we will investigate different strategies to reproducibly fabricate Josephson junctions and junction arrays for different types of qubits. To go beyond the NISQ era, new fabrication techniques like surface passivation, post process treatments, optimal etching parameters and deposition conditions will be investigated to build highly coherent qubits with T1 times exceeding 100 µs. One line of research will focus on exploring the capability of operating superconducting qubits at higher microwave frequencies and the potential to overcome limits of current qubit technologies. New superconducting materials, such as rhenium, vanadium, indium, nitrides and other composite systems, will be employed that have a higher critical temperature than commonly used materials such as aluminum and niobium. Within this thesis, you will grow and optimize thin films of superconducting materials, design and fabricate high-frequency resonators and qubits, and characterize them at millikelvin temperatures with spectroscopic techniques. You will learn the process of superconducting circuit fabrication like photolithography, thin film deposition and reactive ion etching in our in-house cleanroom and you will learn how to control qubits with microwave pulses using an arbitrary waveform generator.
- suitable as
- Master’s Thesis Condensed Matter Physics
- Supervisor: Stefan Filipp