Realization of fast all-microwave CZ gates with a tunable coupler

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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Cited by in corpus (5)

• High-precision pulse calibration of tunable couplers for high-fidelity two-qubit gates in superconducting quantum processors
• In situ Qubit Frequency Tuning Circuit for Scalable Superconducting Quantum Computing: Scheme and Experiment
• Parametric phase modulation in superconducting circuits
• Distributed-HISQ: A Distributed Quantum Control Architecture
• Optimizing Circuit Reusing and its Application in Randomized Benchmarking