An 11-bit 0.008mm 2 charge-redistribution digital-to-analog converter operating at cryogenic temperature for large-scale qubit arrays

[摘要] This letter presents a cryogenic digital-to-analog converter (DAC) for controlling qubits in a large-scale quantum computer. The capacitor arrays composing a charge-redistribution DAC are miniaturized by effectively utilizing the cryogenic characteristics of extremely low noise and leakage. Furthermore, capacitor mismatches due to their small size are automatically corrected by a newly proposed calibration technique with a small area-overhead. Fabricated in 40 nm CMOS and measured at cryogenic temperature, the prototype 11-bit DAC achieved a very small area of 0.3mm2 and low power consumption of 5.8μW, while realizing a non-linearity error within +/-2LSB.

[学科分类] 电子、光学、磁材料

[关键词] cryogenic;digital-to-analog converter (DAC);mismatch calibration;quantum computer