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Realization of High-Fidelity Controlled-Phase Gates in Extensible Superconducting Qubits Design with a Tunable Coupler |
| Yangsen Ye1,2,3, Sirui Cao1,2,3, Yulin Wu1,2,3, Xiawei Chen2, Qingling Zhu1,2,3, Shaowei Li1,2,3, Fusheng Chen1,2,3, Ming Gong1,2,3, Chen Zha1,2,3, He-Liang Huang1,2,3,4, Youwei Zhao1,2,3, Shiyu Wang1,2,3, Shaojun Guo1,2,3, Haoran Qian1,2,3, Futian Liang1,2,3, Jin Lin1,2,3, Yu Xu1,2,3, Cheng Guo1,2,3, Lihua Sun1,2,3, Na Li1,2,3, Hui Deng1,2,3, Xiaobo Zhu1,2,3*, and Jian-Wei Pan1,2,3 |
1Hefei National Laboratory for Physical Sciences at the Microscale and Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China
2Shanghai Branch, CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Shanghai 201315, China
3Shanghai Research Center for Quantum Sciences, Shanghai 201315, China
4Henan Key Laboratory of Quantum Information and Cryptography, Zhengzhou 450000, China
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| Cite this article: |
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Yangsen Ye, Sirui Cao, Yulin Wu et al 2021 Chin. Phys. Lett. 38 100301 |
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Abstract High-fidelity two-qubit gates are essential for the realization of large-scale quantum computation and simulation. Tunable coupler design is used to reduce the problem of parasitic coupling and frequency crowding in many-qubit systems and thus thought to be advantageous. Here we design an extensible 5-qubit system in which center transmon qubit can couple to every four near-neighboring qubits via a capacitive tunable coupler and experimentally demonstrate high-fidelity controlled-phase (CZ) gate by manipulating central qubit and one near-neighboring qubit. Speckle purity benchmarking and cross entropy benchmarking are used to assess the purity fidelity and the fidelity of the CZ gate. The average purity fidelity of the CZ gate is 99.69$\pm 0.04$% and the average fidelity of the CZ gate is 99.65$\pm 0.04$%, which means that the control error is about 0.04%. Our work is helpful for resolving many challenges in implementation of large-scale quantum systems.
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Received: 07 September 2021
Editors Suggestion
Published: 28 September 2021
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| Fund: Supported by the National Key R&D Program of China (Grant No. 2017YFA0304300), the Chinese Academy of Sciences, Anhui Initiative in Quantum Information Technologies, Technology Committee of Shanghai Municipality, the National Natural Science Foundation of China (Grants Nos. 11905217, 11774326, and 11905294), the Shanghai Municipal Science and Technology Major Project (Grant No. 2019SHZDZX01), the Natural Science Foundation of Shanghai (Grant No. 19ZR1462700), the Key-Area Research and Development Program of Guangdong Provice (Grant No. 2020B0303030001), and the Youth Talent Lifting Project (Grant No. 2020-JCJQ-QT-030). |
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