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.
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) Contact: Rene Otten
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) Contact: Prof. Beata Kardynal
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) Contact: Rene Otten
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) Contact: Eugen Kammerloher
M.Sc. Project Silicon quantum devices fabricated by industrial processes
In this project, you will fabricate and characterize the silicon quantum devices with state-of-the art equipment at IHT and our group. This explicitly includes the hands-on improvement and use of industrial fabrication processes in multiple research cleanroom facilities in Aachen and electrical measurements in our low temperature setups and cryostats.
Project description (PDF) Contact: Jan Klos
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
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)
Contact: Prof. Jeremy Witzens (IPH)
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) Contact: Dr. Feng Liu
M.Sc. Project High fidelity manipulation and detection of a qubit in silicon
In this project you will optimise the control and read-out of a spin qubit in silicon. You will learn working with a sophisticated low-temperature measurement set-up. You will confine single electrons in a quantum dot, manipulate the electron spin by electric dipole spin resonance and improve the qubit control
Project description (PDF) Contact: Dr. Lars Schreiber
M.Sc. Project Characterization of silicon qubit devices fabricated on 300 mm wafers
In this project you will characterize and improve industrially manufactured MOS-type two qubit devices. These devices facilitate higher fabrication throughput and reproducibility. You will learn how to tune Si qubit devices in order to form quantum dots and gain experience in low temperature measurements at 10 mK, high frequency, low noise measurement and data analysis using python and matlab.
Project description (PDF) Contact: Dr. Lars Schreiber
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) Contact: Rene Otten
M.Sc. Project Towards electron spin quantum bits in ZnSe
ZnSe exhibits ideal properties for hosting electron spin quantum bits. However, this II/VI semiconductor has not been considered for this purpose. In close collaboration with the group 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 quantum devices using 1K electrical transport experiments.
Project description (PDF) Contact: Dr. Lars Schreiber
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.