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

TitleTunable Spin Qubit Coupling Mediated by a Multi-Electron Quantum Dot
Publication TypeJournal Article
Year of Publication2015
AuthorsSrinivasa, V, Xu, H, Taylor, JM
JournalPhysical Review Letters
Date Published2015/06/04

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

Short TitlePhys. Rev. Lett.