In situ Qubit Frequency Tuning Circuit for Scalable Superconducting Quantum Computing: Scheme and Experiment

• URL: http://arxiv.org/abs/2407.21415v2
• Date: Fri, 27 Dec 2024 03:28:51 GMT
• Title: In situ Qubit Frequency Tuning Circuit for Scalable Superconducting Quantum Computing: Scheme and Experiment
• Authors: Lei Jiang, Yu Xu, Shaowei Li, Zhiguang Yan, Ming Gong, Tao Rong, Chenyin Sun, Tianzuo Sun, Tao Jiang, Hui Deng, Chen Zha, Jin Lin, Fusheng Chen, Qingling Zhu, Yangsen Ye, Hao Rong, Kai Yan, Sirui Cao, Yuan Li, Shaojun Guo, Haoran Qian, Yisen Hu, Yulin Wu, Yuhuai Li, Gang Wu, Xueshen Wang, Shijian Wang, Wenhui Cao, Yeru Wang, Jinjin Li, Cheng-Zhi Peng, Xiaobo Zhu, Jian-Wei Pan,
• Abstract summary: We propose a scalable scheme to tune the qubit frequency by using in situ superconducting circuit. Our work paves the way for large-scale control of superconducting quantum processor.
• Score: 23.955959205144353
• License:
• 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.

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