Robust and fast microwave-driven quantum logic for trapped-ion qubits

Microwave-driven logic is a promising alternative to laser control in scaling trapped-ion based quantum processors. However, such electronic gates have yet to match the speed offered by their laser-driven counterparts. Here, we implement Mlmer-Srensen two-qubit gates on ^43Ca^+ hyperfine clock qubits in a cryogenic (25~K) surface trap, driven by near-field microwaves. We achieve gate durations of 154~ (with 1. 0 (2) \% error) and 331~ (0. 5 (1) \% error), which approaches the performance of typical laser-driven gates. In the 331~ gate, we demonstrate a new Walsh-modulated dynamical decoupling scheme which suppresses errors due to fluctuations in the qubit frequency as well as imperfections in the decoupling drive itself.