SKM 2023 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 50: Materials and devices for quantum technology III

HL 50.12: Talk

Friday, March 31, 2023, 12:45–13:00, JAN 0027

Design of Ultra-Low Power High Speed Communication Interface From Cryogenic to Room Temperature Electronics — •Ege Onat, Jonas Bühler, Christian Grewing, and Stefan van Waasen — Central Institute of Engineering, Electronics and Analytics, ZEA-2: Electronic Systems, Forschungszentrum Jülich GmbH

The objective of this research is to transfer high-speed data from deep cryogenic temperatures to room temperature while aiming for the lowest achievable power consumption in the cryostat. Quantum computers are operated inside dilution refrigerators under deep cryogenic temperatures and they need additional circuitry to ensure fault-free operations. Heating of the qubits caused by additional electronics degrades the system performance. Due to the limited power budget of the dilution refrigerators, each circuit should be designed considering power consumption. In contrast, the higher temperature stage can manage a higher power budget than the stage with the qubits. In this research, low-power data transmission methods for quantum computer applications are investigated and an asymmetric communication interface is designed and implemented. To achieve the asymmetric interface, only a varactor is placed into the cryogenic stage. To measure the capacitance on the room temperature stage, a capacitance readout circuitry is designed. It converts the capacitance into a measurable output such as voltage, frequency, or digital data. By implementing this interface, the data is carried on capacitance rather than voltages, which minimizes the power consumption at the transmitter compared to widely implemented communication interfaces.