A Cryogenic ${1.08mW}$/Qubit Fully-Integrated 4-Channel Frequency-Division-Multiplexing Transmon Qubit State Readout ASIC in 28nm Bulk CMOS
Wenqiang Huang, Yanshu Guo, Tian Tian, Qichun Liu, Guo Wei, Xiaoqian Liu, Tiefu Li, Wen Jia, Yuanjin Zheng, Zhihua Wang, Hanjun Jiang · 2025
In this paper, we propose a cryogenic fully-integrated 4channel Frequency-Division-Multiplexing (FDM) transmon qubit state readout ASIC, with a power consumption of$4.32 \text{mW}(1.08 \text{mW} /$qubit). To the author's knowledge, it achieves the lowest power consumption compared to other qubit state readout receiver. By adopting ultra-narrow band zero-IF topology aided by 18-tap Analog Finite Impulse Response low pass filter (AFIR-LPF) with 40 dB stop-band rejection, the chip is able to detect four qubits simultaneously in our test system and achieves at least 92 % readout fidelity in four qubits FDM readout measurement.