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Silicon spin qubits are a promising quantum computing platform offering longcoherence times, small device sizes, and compatibility with industry-backeddevice fabrication techniques. In recent years, high fidelity single-qubit andtwo-qubit operations have been demonstrated in Si. Here, we demonstratecoherent spin control in a quadruple quantum dot fabricated using isotopicallyenriched 28Si. We tune the ground state charge configuration of the quadrupledot down to the single electron regime and demonstrate tunable interdot tunnelcouplings as large as 20 GHz, which enables exchange-based two-qubit gateoperations. Site-selective single spin rotations are achieved using electricdipole spin resonance in a magnetic field gradient. We execute a resonant-CNOTgate between two adjacent spins in 270 ns.

Site-selective quantum control in an isotopically enriched 28Si/SiGe quadruple quantum dot