B.Sc. and M.Sc. Projects

 

Experimental Simulation and Modelling Theory

 

Experimental

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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.

  Scanning electron micrograph of the silicon QuBus Inga Seidler

M.Sc.-Project Fabrication and characterization of a quantum-bus in silicon

In this project you will fabricate and characterize a single electron spin quantum bus using cutting-edge ebeam lithography at HNF (FZ Jülich) and 10 mK electronic tranport measurements at IQI, RWTH. As a first step the functionality of the single-electron charge detector at the end of the QuBus and the gate isolation is tested before single electrons can be transported.

Project description (PDF) Contact: Lars Schreiber

  Scanning electron micrograph of the gate structure of a double quantum dot Tim Leonhardt

Assigned M.Sc.-Project High-fidelity manipulation and detection of a qubit in silicon

In this project you will fabricate and characterize a double quantum dot in isotopically purified 28Si using cutting-edge ebeam lithography at HNF (FZ Jülich) and 10 mK electronic tranport measurements at RWTH. In 28Si spin dephasing by nuclear spins is suppressed. An aysmmetric charge sensor will enhance the output swing and thus the detection fidelity of the single electron charge detector.

Project description (PDF) Contact: Lars Schreiber

  Schematic of a ZnSe double quantum dot Lars Schreiber

Assigned 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 collaboaration wih the group of Alex Pawlis (FZ Jülich), who is expert in the growth of (Zn,Mg)Se hetersotructure, you will fabricate electrical contacts to (Zn,Mg)Se heterostructures and electrically characterize their quality using 1K electrical transport experiments.

Project description (PDF) Contact: Lars Schreiber

  Typical spectra of an InAs quantum dot 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)

 


 

Simulation and Modelling

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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.

 


 

Theory

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Please find a couple of examples of theoretical projects below. However, we always consider unsolicited applications. Please contact the principal investigator with whom you want to work to discuss possible projects.

  Hall bar David DiVincenzo

B.Sc. Project

Hall Effect Gyrator

This work will continue recent investigations in our group on the action of an essential component in quantum microwave science, the gyrator. Here you will do calculations of the real-time propagation of electromagnetic fields in this device. Contact: David DiVincenzo

  Qubit-Heterostructure Pascal Cerfontaine

B.Sc. Project Improved Quantum Dot Qubits

In this project you will explore theoretically variants of the semiconductor quantum dot to perform quantum gate fidelity and readout. There will be an emphasis on tailoring the spin-orbit action to achieve optimal performance, and on varying the electron number and confinement strength. Contact: David DiVincenzo

  Flux Qubit Gianluigi Catelani

B.Sc. and M.Sc. Projects Superconducting Qubits

In these projects you will study theoretically some basic properties (energy levels, wave functions, matrix elements) of superconducting qubits such as the fluxonium and the flux qubit. These properties can be accurately calculated numerically in most cases, especially if the problem reduces to that of a quantum particle in a one-dimensional potential. The goal here is to construct an approximate but accurate analytical solution to such a quantum-mechanical problem, using perturbation theory, the WKB approximation, etc. For a B.Sc. project, a symmetric double-well potential will be analyzed. Extension of the results to asymmetric potentials, and to two- or three-dimensional problems, can be considered for a M.Sc. project. Contact: Gianluigi Catelani (g.catelani@fz-juelich.de)