On-chip direct-current source for scalable superconducting quantum computing
/ Authors
Lei Jiang, Yu Xu, Shaowei Li, Zhiguang Yan, M. Gong, Tao Rong, Chenyin Sun, Tianzuo Sun, Tao Jiang, H. Deng
and 24 more authors
C. Zha, Jin Lin, Fusheng Chen, Qingling Zhu, Y. Ye, H. Rong, Kai Yan, S. Cao, Yuan Li, Shaojun Guo, H. Qian, Yisen Hu, Yulin Wu, Yuhuai Li, Gang Wu, Xueshen Wang, Shijian Wang, W. Cao, Yeru Wang, Yongxu Huo, Jinjin Li, Cheng-Zhi Peng, Xiaobo Zhu, Jian-Wei Pan
/ Abstract
Frequency tunable qubit plays a significant role for scalable superconducting quantum processors. The state-of-the-art room-temperature electronics for tuning qubit frequency suffers from unscalable limit, such as heating problem, linear growth of control cables, etc. Here we propose a scalable scheme to tune the qubit frequency by using in situ superconducting circuit, which is based on radio frequency superconducting quantum interference device (rf-SQUID). We demonstrate both theoretically and experimentally that the qubit frequency could be modulated by inputting several single pulses into rf-SQUID. Compared with the traditional scheme, our scheme not only solves the heating problem, but also provides the potential to exponentially reduce the number of cables inside the dilute refrigerator and the room-temperature electronics resource for tuning qubit frequency, which is achieved by a time-division-multiplex (TDM) scheme combining rf-SQUID with switch arrays. With such TDM scheme, the number of cables could be reduced from the usual $\sim 3n$ to $\sim \log_2{(3n)} + 1$ for two-dimensional quantum processors comprising $n$ qubits and $\sim 2n$ couplers. Our work paves the way for large-scale control of superconducting quantum processor.
Journal: Physical Review Applied
DOI: 10.1103/qwvv-mz8s