title: Charge-Insensitive Single-Atom Spin-Orbit Qubit in Silicon.
abstract: High fidelity entanglement of an on-chip array of spin qubits poses many challenges. Spin-orbit coupling (SOC) can ease some of these challenges by enabling long-ranged entanglement via electric dipole-dipole interactions, microwave photons, or phonons. However, SOC exposes conventional spin qubits to decoherence from electrical noise. Here, we propose an acceptor-based spin-orbit qubit in silicon offering long-range entanglement at a sweet spot where the qubit is protected from electrical noise. The qubit relies on quadrupolar SOC with the interface and gate potentials. As required for surface codes, 10^{5} electrically mediated single-qubit and 10^{4} dipole-dipole mediated two-qubit gates are possible in the predicted spin lifetime. Moreover, circuit quantum electrodynamics with single spins is feasible, including dispersive readout, cavity-mediated entanglement, and spin-photon entanglement. An industrially relevant silicon-based platform is employed.
authors.affiliation: School of Physics, The University of New South Wales, Sydney, New South Wales 2052, Australia.|Centre for Quantum Computation and Communication Technology, The University of New South Wales, Sydney, New South Wales 2052, Australia.
authors.forename: Joe
authors.initials: J
authors.lastname: Salfi
authors.affiliation: School of Physics, The University of New South Wales, Sydney, New South Wales 2052, Australia.|Centre for Quantum Computation and Communication Technology, The University of New South Wales, Sydney, New South Wales 2052, Australia.
authors.forename: Jan A
authors.initials: JA
authors.lastname: Mol
authors.affiliation: School of Physics, The University of New South Wales, Sydney, New South Wales 2052, Australia.
authors.forename: Dimitrie
authors.initials: D
authors.lastname: Culcer
authors.affiliation: School of Physics, The University of New South Wales, Sydney, New South Wales 2052, Australia.|Centre for Quantum Computation and Communication Technology, The University of New South Wales, Sydney, New South Wales 2052, Australia.
authors.forename: Sven
authors.initials: S
authors.lastname: Rogge