All-microwave CZ gate based on fixed-frequency driven coupler
Wanpeng Gao(高万鹏)1,2, Xiaoliang He(何潇梁)1,2, Zhengqi Niu(牛铮琦)1,3, Daqiang Bao(包大强)1, Kuang Liu(刘匡)1, Junfeng Chen(陈俊锋)1,2, Zhen Wang(王镇)1,2,3, and Z. R. Lin(林志荣)1,2,†
1 State Key Laboratory of Materials for Integrated Circuits, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China; 2 University of Chinese Academy of Sciences, Beijing 100049, China; 3 ShanghaiTech University, Shanghai 201210, China
Abstract High-quality entangling gates are crucial for scalable quantum information processing. Implementing all-microwave two-qubit gates on fixed-frequency transmons offers advantages in reducing wiring complexity, but the gate performance is often limited due to the residual interaction and the frequency crowding problem. Here, we introduce a novel scheme that enables a microwave drive-activated CZ gate compatible with the coupler structure to suppress the residual interaction. The microwave drive is applied to the coupler and the microwave drive frequency remains far detuned from the system's transition frequency to alleviate the frequency crowding problem. We model the gate process analytically and demonstrate a theoretical gate fidelity up to 99.9% numerically. Our scheme is compatible with current coupler-structure-based circuits, and insensitive to microwave crosstalk, showing a possible path for all-microwave quantum operations at scale.
Received: 23 January 2025
Revised: 14 February 2025
Accepted manuscript online: 17 February 2025
PACS:
03.67.Lx
(Quantum computation architectures and implementations)
Fund: Project supported by the Key-Area Research and Development Program of Guangdong Province, China (Grant No. 2020B0303030002), the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDB0670000), and the National Key Research and Development Program of China (Grant No. 2023YFB4404904).
Corresponding Authors:
Z. R. Lin
E-mail: zrlin@mail.sim.ac.cn
Cite this article:
Wanpeng Gao(高万鹏), Xiaoliang He(何潇梁), Zhengqi Niu(牛铮琦), Daqiang Bao(包大强), Kuang Liu(刘匡), Junfeng Chen(陈俊锋), Zhen Wang(王镇), and Z. R. Lin(林志荣) All-microwave CZ gate based on fixed-frequency driven coupler 2025 Chin. Phys. B 34 040304
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