Oral: Cryogenic current and amplifier development for spin-to-charge readout

Advanced silicon-based quantum computing depends on the development of both analog and digital classical circuits operating in close proximity to qubits, requiring these circuits to function in cryogenic environments. Ideally, these circuits will be in the same silicon as the qubits, providing the switching, amplification, and thresholding for performing qubit manipulation and projective readout. However, the even simple component properties (resistance, capacitance, etc.) change dramatically between room temperature and cryogenic temperatures. Therefore, developing cryogenic helper circuits depends on developing new component and circuit models for cryogenic temperatures. In this talk, I will first present results from a series of measurements starting with simple, easily sourced components like capacitors, resistors, and transistors at cryogenic temperatures. I will then show results from simple current mirror and differential voltage amplifier circuits constructed from these components and implemented at cryogenic temperatures. Finally, I will show characterization measurements and ad hoc models from custom, foundry made transistors and discuss progress toward developing larger circuit models for monolithic implementation.