A 40-nm Cryo-CMOS Quantum Controller IC for Superconducting Qubit
Kiseo Kang, Donggyu Minn, Seongun Bae, Jaeho Lee, Seokhyeong Kang, Moonjoo Lee, Ho-Jin Song, Jae‐Yoon Sim
Abstract
This article presents a cryo-CMOS quantum controller IC for superconducting qubits. The proposed globally synchronized clock system internally generates different local oscillator (LO) frequencies using multiple phase-locked loops (PLLs) driven by a common reference clock. It provides flexibility in spectral management as well as scalability for expansion to a large-scale quantum controller. The test chip includes two PLLs, four pulse modulator channels, and two receiver channels. Implemented chip in 40-nm CMOS shows full functionalities at 3.5 K. The designed pulse modulator circuits are verified with the specifications for expected fidelity of 99.99%.