29.4 A Cryo-CMOS Quantum Computing Unit Interface Chipset in 28nm Bulk CMOS with Phase-Detection Based Readout and Phase-Shifter Based Pulse Generation.

Cryogenic CMOS (Cryo-CMOS) ASICs have drawn increasing attention with great potential in scaling down the quantum computing (QC) platform. Recently, several cryoCMOS ASICs have been presented in the literature, including the qubit state readout ASICs [1–4] and state controller ASICs [5–8]. For readout ASICs, the quadrature down conversion architecture is widely adopted, with the power consumption ranging from 20mW [1] to 75mW [2]. Also, significant progress has been made in reducing the power consumption of qubit controllers. The controller in [5] consumes a power of <4 mW/qubit under active control, when controlling a superconducting quantum computing unit cell. Nevertheless, it remains a long-term goal to reduce the power consumption and promote the integration level of readout/controller ASICs, in consideration of the increasing requirement on qubit number and the limited cooling power provided by the dilution refrigerator.