Master Thesis - Cryogenic Analog Demultiplexer for Scalable Electron-Spin Qubit Control

Forschungszentrum Jülich, Germany

Updated: about 12 hours ago

In this interdisciplinary Master project, you will design, model, and simulate cryogenic control electronics for scalable electron-spin qubit systems. The core challenge is enabling multi-qubit control while minimizing wiring overhead, heat load, and noise at millikelvin temperatures.

The thesis includes developing models, circuit designs, and simulation frameworks that:

  • Investigate cryogenic behavior of transistors, switches, and capacitors including relevant noise mechanisms (leakage, charge injection, kT/C, etc.)
  • Analyze how noise from cryogenic control electronics couples into gate electrodes and affects control accuracy in Si/SiGe spin-qubit systems
  • Develop compact Python-based models of these electronics for integration into quantum-mechanical simulations
  • Design and evaluate cryogenic demultiplexer and switch-capacitor topologies through circuit-level simulations including parasitics

The goal is to enable scalable, low-noise control architectures for future multi-qubit systems.


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