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High fidelity entanglement of an on-chip array of spin qubits poses manychallenges. Spin-orbit coupling (SOC) can ease some of these challenges byenabling long-ranged entanglement via electric dipole-dipole interactions,microwave photons, or phonons. However, SOC exposes conventional spin qubits todecoherence from electrical noise. Here we propose an acceptor-based spin-orbitqubit in silicon offering long-range entanglement at a sweet spot where thequbit is protected from electrical noise. The qubit relies on quadrupolar SOCwith the interface and gate potentials. As required for surface codes, $10^5$electrically mediated single-qubit and $10^4$ dipole-dipole mediated two-qubitgates are possible in the predicted spin lifetime. Moreover, circuit quantumelectrodynamics with single spins is feasible, including dispersive readout,cavity-mediated entanglement, and spin-photon entanglement. An industriallyrelevant silicon-based platform is employed.

Charge-insensitive single-atom spin-orbit qubit in silicon