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.

  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 low-temperature (15 mK) measurement setup, you will control two qubits with advanced high-frequency control and readout electronics.
Project description (PDF) Contact: 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)

  Chevron pattern Copyright: Tom Struck

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: Lars Schreiber

  GaAs sample Copyright: Rene 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) Contact: Rene Otten

  Scanning electron micrograph of the silicon QuBus Copyright: 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

  Schematic of a ZnSe double quantum dot Copyright: Lars Schreiber

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 using 1K electrical transport experiments.

Project description (PDF) Contact: Lars Schreiber

  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)

 


 

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.

  Nonlinear transmission line Copyright: Ananda Roy

M.Sc. Project Quantum state-transfer in nonlinear transmission lines​

Efficient and reliable transfer of quantum states between spatially separated quantum entities is indispensable for quantum information processing. Consider the scenario when information is stored at distant nodes of a network in localized degrees of freedom (atoms and/or resonator modes) and propagating photonic wavepackets serve as carriers of information between these nodes. In this scenario, perfect transfer of a quantum state from one node to another involves tuning the local interactions of the various degrees of freedom at the source to generate an outgoing photonic wavepacket with a specific temporal mode. This temporal mode after propagation along a transmission line or optical fiber is perfectly captured at the destination resonator, thereby accomplishing the task of perfect transfer. Here, we propose an orthogonal approach, where instead of tuning the local degrees of freedom at the different nodes, we engineer the quantum channel serving as the conduit of information to modify the spatio-temporal profile as well as the internal state of the propagating mode. The goal of this project will be to apply inverse scattering method to engineer nonlinear transmission lines that generate desired classical and non-classical states relevant for continuous variable quantum information processing. Contacts: , Fabian Hassler, or David DiVincenzo

  Hall bar Copyright: 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 Copyright: 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 Copyright: 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)