0.25 mW/qubit, 5.7-7.5 GHz Cryogenic CMOS Microwave Signal Selector Using Dual-Stage Injection-Locked Oscillator for Frequency-Multiplexed Qubit Control

Cryogenic CMOS (cryo-CMOS) quantum bit (qubit) control circuits are expected to overcome the interconnect complexity problem in large-scale quantum computers. However, since each qubit has a unique frequency for control, many power-hungry oscillators are needed to generate the frequencies at the cryogenic temperature stage of a refrigerator. In this paper, to remove the oscillators from the refrigerator, we propose a cryo-CMOS signal selector consisting of two injection-locked oscillators that extract the specified frequency tone for qubit control from the multi-tone microwave signal. This can realize an efficient frequency-multiplexed qubit control system with 1/30 power consumption of the conventional systems.