Silvano De Franceschi

Owing to their intrinsic spin-orbit coupling, hole spin qubits are responsive to electric field excitation. This can allow for efficient electrically-driven spin control as well as for spin cavity quantum electrodynamics, thereby opening interesting prospects for qubit control, readout, and long-range coupling. Spin-electric susceptibility, however, renders hole qubits generally vulnerable to electrical noise, which limits their coherence time. Here we investigate the coherence properties of a single hole electrostatically confined in a natural silicon metal-oxide-semiconductor device made using an industry-compatible fabrication process. By varying the magnetic field orientation, we reveal the existence of operation sweet spots where the impact of charge noise is minimized while preserving an efficient electric-dipole spin control. We correspondingly observe an extension of the Hahn-echo coherence time up to 88 μs, exceeding by an order of magnitude the best reported values for hole- spin qubits, and approaching the state-of-the-art for electron-spin qubits with synthetic spin-orbit coupling in isotopically-purified silicon. This finding largely enhances the prospects of silicon-based hole spin qubits for scalable quantum information processing.