We propose and experimentally demonstrate a global parametric gate that generates multi-qubit entangled states in a single step. By applying a parametric drive to a common qubit at precise detunings relative to computational qubits, we directly produce two-, three-, and four-qubit entanglement with state fidelities of 99.4\%\pm0.2\%, 93.4\%\pm0.3\%, and 91.4\%\pm0.3\%, respectively. This scheme enables efficient, reconfigurable control using only microwave drives and is compatible with fixed-frequency qubits. Error analyses indicate that infidelity stems primarily from decoherence and coherent control errors, with negligible contributions from static ZZ coupling and flux noise. Furthermore, simulations with state-of-the-art parameters predict this global gate can generate high-fidelity (99.70\%) entanglement in systems of up to six qubits.
@article{arxiv.2601.01826,
title = {Global Parametric Gates for Multi-qubit Entanglement},
author = {Jize Yang and Lin Guo and Haonan Xiong and Jiahui Wang and Yan Li and Yunfan Yang and Chenjie An and Hongyi Zhang and Luyan Sun and Yipu Song and Luming Duan},
journal= {arXiv preprint arXiv:2601.01826},
year = {2026}
}