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Realization of Fast All-Microwave Controlled-Z Gates with a Tunable Coupler |
Shaowei Li1,2,3, Daojin Fan1,2,3, Ming Gong1,2,3, Yangsen Ye1,2,3, Xiawei Chen1,2,3, Yulin Wu1,2,3, Huijie Guan1,2,3, Hui Deng1,2,3, Hao Rong1,2,3, He-Liang Huang1,2,3, Chen Zha1,2,3, Kai Yan1,2,3, Shaojun Guo1,2,3, Haoran Qian1,2,3, Haibin Zhang1,2,3, Fusheng Chen1,2,3, Qingling Zhu1,2,3, Youwei Zhao1,2,3, Shiyu Wang1,2,3, Chong Ying1,2,3, Sirui Cao1,2,3, Jiale Yu1,2,3, Futian Liang1,2,3, Yu Xu1,2,3, Jin Lin1,2,3, Cheng Guo1,2,3, Lihua Sun1,2,3, Na Li1,2,3, Lianchen Han1,2,3, Cheng-Zhi Peng1,2,3, Xiaobo Zhu1,2,3*, and Jian-Wei Pan1,2,3 |
1Department 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
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Cite this article: |
Shaowei Li, Daojin Fan, Ming Gong et al 2022 Chin. Phys. Lett. 39 030302 |
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Abstract The development of high-fidelity two-qubit quantum gates is essential for digital quantum computing. Here, we propose and realize an all-microwave parametric controlled-Z (CZ) gates by coupling strength modulation in a superconducting Transmon qubit system with tunable couplers. After optimizing the design of the tunable coupler together with the control pulse numerically, we experimentally realized a 100 ns CZ gate with high fidelity of 99.38%$ \pm 0.34$% and the control error being 0.1%. We note that our CZ gates are not affected by pulse distortion and do not need pulse correction, providing a solution for the real-time pulse generation in a dynamic quantum feedback circuit. With the expectation of utilizing our all-microwave control scheme to reduce the number of control lines through frequency multiplexing in the future, our scheme draws a blueprint for the high-integrable quantum hardware design.
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Received: 06 January 2022
Express Letter
Published: 10 February 2022
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PACS: |
03.65.Ud
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(Entanglement and quantum nonlocality)
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03.67.Mn
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(Entanglement measures, witnesses, and other characterizations)
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42.50.Dv
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(Quantum state engineering and measurements)
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42.50.Xa
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(Optical tests of quantum theory)
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