摘要
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%±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.
基金
the USTC Center for Micro-and Nanoscale Research and Fabrication for supporting the sample fabrication
Quantum CTek Co.,Ltd.for supporting the fabrication and the maintenance of room-temperature electronics
supported by the National Key R&D Program of China(Grant No.2017YFA0304300)
the Chinese Academy of Sciences
the Anhui Initiative in Quantum Information Technologies
the Technology Committee of Shanghai Municipality
the National Natural Science Foundation of China(Grants No.11905217 and 11905294)
the Natural Science Foundation of Shanghai(Grant No.19ZR1462700)
he Key-Area Research and Development Program of Guangdong Province(Grant No.2020B0303030001)
the China Postdoctoral Science Foundation。
