Two-qubit gates on cavity-coupled spin-qubit systems

A critical element towards the realization of quantum networks is non-local coupling between nodes. Scaling connectivity beyond nearest-neighbor interactions requires the implementation of a mediating interaction often termed a “quantum bus”. Cavity photons have long been used as a bus by the superconducting qubit community, but it has only recently been demonstrated that spin-based qubits in double quantum dot architectures can reach the strong coupling regime [1,2] and exhibit spin-spin interactions via real or virtual photons [3,4]. The capability to perform two-qubit gates is expected in the dispersive regime, where cavity loss plays a less prominent role [5]. Here we explore the potential for non-local quantum gating schemes between single-spin qubits mediated by virtual photons.

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