Experimentelle Arbeiten

  Schematic of the readout circuit using a heterojunction bipolar transistor Urheberrecht: © Rene Otten

M.Sc.-Arbeit Spin Qubit Readout using Cryogenic Amplifiers

In this project, you will establish spin qubit readout using cryogenic amplification in our group. You will adopt findings from previous work into an experimental setup to improve the readout speed of our qubits by utilizing transistors at mK temperatures. Further, you will evaluate different amplifier designs and transistor types for their suitability for this talk in the future.

Projektbeschreibung (PDF)

  Charakterisierung von Spin-Qubit-Bauelementen mit hohem durchsatz Urheberrecht: © Struck/Jhih-Sian

M.Sc.-Arbeit High Throughput Spin Qubit Device Characterization

In this project, you will develop and improve methods for fast and high-throughput characterisation of Si/SiGe quantum dot devices. These methods are of great importance to quickly evaluate device performance to give fast feedback to industrial fabrication. You will measure on low temperature setups at 4K and 10mK and work on soft- as well as hardware.

Projektbeschreibung (PDF)

  Thermische Lösungen für das Quantencomputing im großen Maßstab Urheberrecht: © Otten/Surrey

B.Sc.-Arbeit Thermal Solutions for Large Scale Quantum Computing

In this project, you will perform thermal simulations of our experiments in order to gain insights on the performance and constraints for large scale quantum computing. You will devise an experiment to gather the necessary low temperature data needed for a cryo-toolkit for spin qubits. This knowledge is essential for future quantum processors.

Projektbeschreibung (PDF)

  Kryogene DACs für Spin Qubit Kontrolle Urheberrecht: © Otten/Surrey

M.Sc.-Arbeit Kryogene DACs für Spin Qubit Kontrolle

In this project, you will measure the performance of a custom developed cryogenic digital-to-analog converter (DAC) by connecting its outputs to the DC gate electrodes of a spin qubit. Crogenic control electronics like this DAC present a promising route for scaling qubits from lab to industrial applications.

Projektbeschreibung (PDF)

  Typical spectra of an InAs quantum dot Urheberrecht: © Kardynal

B.Sc. Arbeit 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.

Projektbeschreibung (PDF)

  Optical cavity Urheberrecht: © 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)

  Schema eines Doppelquantenpunktes in ZnSe Urheberrecht: © Schreiber

M.Sc. Arbeit: Entwicklung von Elektron-Spinqubits in ZnSe mit Schattenmaskentechnologie

ZnSe hat ideale Eigenschaften in Hinblick auf Quantumcomputer mit Elektronenspins als Qubits. Bisher jedoch wurde es für diesen Zweck noch nicht näher untersucht. Unter Anleitung von Alex Pawlis (FZ Jülich), der Experte im Wachstum von (Zn,Mg)Se Schichten ist, werden Sie (Zn,Mg)Se Heterostrukturen charakerisieren und Quanten-Bauelemente fabrizieren.


Projektbeschreibung (PDF)

 

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