Development of 150 mV Pulse-driven AC Quantum Voltage Chip
XU Sisi1,2, CHENG Qianshuo2, LI Xiaoyu1,2, HAN Qina2,3, ZHONG Qing2, LI Jinjin2, CAO Wenhui2, ZHONG Yuan2
1.College of metrology and measurement engineering， China Jiliang University， Hangzhou， Zhejiang 310018， China
2.National Institute of Metrology， Beijing 100029， China
3.Harbin Institute of Technology， Harbin， Heilongjiang 150001， China
Abstract：The superconducting chip is the core part of the Josephson arbitrary waveform synthesizer （JAWS） system. In the JAWS chip developed by the National Institute of Metrology （NIM）， tapered coplanar waveguide is utilized to compensate for variations in the driving pulse intensity experienced by Josephson junctions at different positions within the array. The electrical performance of the chip is verified through testing its I-V curves and synthesizing AC signals driven by pulses. In this chip， a Josephson junction array consisted by 4000 2-stack Nb/NbxSi1–x/Nb junctions， so there are totally 8000 junctions in serially connection. An oversampled delta-sigma pulse modulation system is used to generate a 14.4 Gbps bitstream to drive this Josephson junctions array. This array is capable to provide a 150 mV rms 1 kHz ac voltage output. The highest harmonic is the second， which is suppressed by at least 105 dBc.
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2025, Vol. 46 
