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We present an approach for entangling electron spin qubits localized onspatially separated impurity atoms or quantum dots via a multi-electron,two-level quantum dot. The effective exchange interaction mediated by the dotcan be understood as the simplest manifestation ofRuderman-Kittel-Kasuya-Yosida exchange, and can be manipulated through gatevoltage control of level splittings and tunneling amplitudes within the system.This provides both a high degree of tuneability and a means for realizinghigh-fidelity two-qubit gates between spatially separated spins, yielding anexperimentally accessible method of coupling donor electron spins in siliconvia a hybrid impurity-dot system.

Tunable Spin Qubit Coupling Mediated by a Multi-Electron Quantum Dot