An SOT-switchable micromagnet scheme of adiabatic geometric gates for silicon spin qubits

Abstract Geometric phase gates have attracted considerable attention due to their intrinsic robustness against certain types of noise. Significant progress has been achieved in implementing geometric phase gates using microwave control in silicon-based electron spin systems. In this work, we propose an alternative geometric phase gate protocol that differs fundamentally from microwave driving approaches by leveraging square-wave control of rapidly switchable micromagnets driven by spin–orbit torque (SOT) to achieve fast and precise magnetic field modulation. By employing square-wave currents to control magnetization switching, our approach relaxes the requirements on waveform precision while significantly suppressing crosstalk. Moreover, our scheme inherently preserves trajectory closure at the end of each operation, effectively mitigating noise-induced path deviation and enhancing gate robustness even under strong noise conditions, thereby offering a promising pathway toward efficient and reliable quantum operations in large-scale qubit arrays.