Experimental projects

 

Unsolicited applications

In addition to the advertised projects, we are always happy about unsolicited applications. Please contact the principal investigator with whom you'd like to work to discuss possible projects.

  Real experiments developed for school practicals as an intro to quantum physics Copyright: © Kral

B.Sc. Project Further development of an experiment to illustrate the wave-particle duality

In this project you will work on the further development of a setup to illustrate the wave-particle duality. Different components will be tested in the setup and experimental data will be evaluated. Furthermore, new evaluation software for the setup shall be written, which can be used in as many computer systems as possible. The objective is to use the setup in an experimental module of the physics labs for school students.

Project description (PDF)

  Hong-Ou-Mandel effect Copyright: © qutools

B.Sc. Project Development of the Hanbury-Brown-Twiss and Hong-Ou-Mandel experiments to be used with high school students

In this project you will work with experiments on the Hanbury-Brown-Twiss effect as well as the Hong-Ou-Mandel effect. Both experiments are to be used in an experimental module of the physics lab for high school students. The experiments will be used in physics practical courses, so the instructions provided currently are aimed at physics students. The objective is to adapt the content of the experiments, particularly at the mathematical level, so that the difficulty of the tasks is adequate for high school students.

Project description (PDF)

  Neural net Copyright: © Otten

B.Sc. Project Machine Learning techniques for automated tuning of quantum dots

In this project, you will research and implement machine-learning techniques to identify certain features in a measured set of charge stability diagrams and classify the data by the number of quantum dots. The goal of this project is not only to implement first machine learning approaches and use them for automated tuning, but also to establish this knowledge in our group.

Project description (PDF)

  Typical spectra of an InAs quantum dot Copyright: © Kardynal

B.Sc. Project Dark-field microscopy for resonant excitation of self-assembled quantum dots

In this project, you will develop dark-field optical microscopy setup based on polarization optics. You will use it to characterise properties of the InAs quantum dots under resonant excitation. To achieve this goal you will add the polarization optics in the existing micro-photoluminescence setup and develop an algorithm to align it for a maximum signal to background ratio.

Project description (PDF)

  Cryogenic HBT amplifiers for Spin Qubit Readout Copyright: © Otten

M.Sc. Project Cryogenic HBT amplifiers for Spin Qubit Readout

In this project, you will measure the HBT amplifier connected to the sensing quantum dot on one of our qubit chips. These measurements include basic tune-up and noise performance analysis of the transistor in different bias regimes as well as tuning of a qubit next to the readout circuit. Further, you will analyse the back action of the transistor on the qubit using the relaxation rate T1. Additionally, you will measure and characterize HBTs produced by different manufactures and processes and evaluate them as alternatives for qubit readout.

Project description (PDF)

  Spin qubit readout Copyright: © Kammerloher

M.Sc. Project Characterisation of an ASD for Spin Qubit Readout

In this project, you will measure one or several quantum devices with an integrated Asymmetric Sensing Dot (ASD) in one of our dilution refrigerators. These measurements include the tune-up of the ASD, as well as a conventional SD and a qubit between both. Further, you will analyse the back action of the ASD on the qubit using the relaxation rate T1. Valuable insights from this experimental work can lead to a coauthored publication.
Additionally, you will model the ASD performance in combination with a transistor readout and validate your findings experimentally.

Project description (PDF)

  GaAs sample Copyright: © Cerfontaine

M.Sc. Project Experimental High-Fidelity Two-Qubit Gates for Spin Qubits

In this project you will work on the experimental demonstration and characterization of a two-qubit gate mediated by the exchange interaction. Using a sophisticated 15 mK measurement setup, you will control two qubits with advanced high-frequency control and readout electronics.

Project description (PDF) Contact: Dr. Pascal Cerfontaine

  Optical cavity Copyright: © Witzens

M.Sc. Project: Time Multiplexed Optical Qubit Readout

In this project, you will be designing optical cavities to facilitate the collection of photons emitted by quantum dots into optical fibers. This project is part of a new activity initiated by the Chair of Integrated Photonics (IPH) together with the Quantum Technology Group on time-interleaved (multiplexed) optical readout of quantum dots.

Project description (PDF)

  GaAs device Copyright: © Liu

M.Sc. Project The development of an optically-active gate-defined quantum dot

In this project, you will build an optical setup to conduct a systematic characterization of a new type of optically-active gate-defined quantum dot. Such quantum dot can be used to create an optical interface between flying photonic qubits and stationary spin qubits, which is a building block for quantum Internet.

Project Description (PDF)

  GaAs sample Copyright: © Otten

M.Sc. Project 3D Integration of Semiconductor Based Spin-Qubits

In this project, you will develop a flip chip process for a 42 qubit device. Large qubit numbers require a high contact density and tight integration with control hardware, both of which can benefit from modern assembly processes. Flip-Chip bonding is a well-established in industry process and will be developed for quantum chips in this project.

Project description (PDF)

  Scanning electron micrograph of the silicon QuBus Copyright: © Seidler

B.Sc.-Project Impacts of charged defects in Si/SiGe on Quantum Bus

By Including defects as an electrostatic perturbation you will model their influence on the propagating potnetial wave of the QuBus device. Within our electrostatic model, we consider various positions of fdefetcs with respect to the QuBus and solve Schroedinger equation for the transfer potential. As a result a critical density of charged defetcs in the Si/SiGe hetersostructure has to be predicted.

Project description (PDF) Contact: Dr. Lars Schreiber

  Schematic of a ZnSe double quantum dot Copyright: © Schreiber

M.Sc. Project: Development of electron spin qubits in ZnSe using a shadow-mask technology

ZnSe exhibits ideal properties for hosting electron spin quantum bits. However, this II/VI semiconductor has not been considered for this purpose. Under supervision of Alex Pawlis (FZ Jülich), who is an expert in the growth of (Zn,Mg)Se heterostructures, you will electrically characterize (Zn,Mg)Se heterostructures and fabricate quantum dot devices.


Project description (PDF) Contact: PD Alex Pawlis

 

Additionally to the advertised projects, we are always very happy about unsolicited applications. Please contact the principal investigator who you want to work with to discuss possible projects.