%0 Journal Article
%J Physical Review Letters
%D 2015
%T Tunable Spin Qubit Coupling Mediated by a Multi-Electron Quantum Dot
%A V. Srinivasa
%A H. Xu
%A J. M. Taylor
%X 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.
%B Physical Review Letters
%V 114
%P 226803
%8 2015/06/04
%G eng
%U http://arxiv.org/abs/1312.1711v3
%N 22
%! Phys. Rev. Lett.
%R 10.1103/PhysRevLett.114.226803