Lea Schreckenberg - DR project
Integration of Scalable Control Electronics with GaAs and SiGe Spin Qubits for Quantum Computer Applications
Doctoral Researcher: Lea Schreckenberg
Local ZEA-2 Supervisor: Carsten Degenhardt
Academic Supervisor: Stefan van Waasen, University of Duisburg-Essen (UDE)
Topic: Quantum Computing
Research Field: Information
A universal quantum computer requires the control and read out of millions of physical quantum bits (qubits) and additionally a cryogenic operation temperature. Due to wiring limitation in current state of-the-art dilution refrigerators scaling up to millions of qubits with room-temperature electronics is challenging. Integrated Circuits (ICs) operating next to the qubits will help solving this scalability problem but require novel approaches for cryogenic circuits.
Thus, the main challenge of this research project is the combination of a developed control IC for DC biasing and a SiGe qubit sample at the milli-kelvin stage. This goal additionally requires a transfer of knowledge for electrical engineers to learn how to handle various qubit samples and to use them as a measurement device. Furthermore, the development of a scalable setup of the cryogenic sample space for further verifications and measurements is needed. This includes a thermal management concept for PCB mounting, sample handling and IC heat sinking.
 P. N. Vliex, “Modelling, implementation and characterization of a Bias-DAC in CMOS as a building block for scalable cryogenic control electronics for future quantum computers” (Forschungszentrum Jülich GmbH, 2021), ISBN: 9783958065888.
 R. Otten, L. Schreckenberg, P. Vliex et al., "Qubit Bias using a CMOS DAC at mK Temperatures," 2022 29th IEEE International Conference on Electronics, Circuits and Systems (ICECS), Glasgow, United Kingdom, 2022, pp. 1-4, doi: 10.1109/ICECS202256217.2022.9971043.