Single-spin manipulation in a double quantum dot in the field of a micromagnet
Stefano Chesi1, Ying-Dan Wang2, Jun Yoneda3, Tomohiro Otsuka3, Seigo Tarucha3, and Daniel Loss4
Beijing Computational Science Research Center, Beijing, China1
Institute of Theoretical Physics, Chinese Academy of Science, Beijing, China2
Center for Emergent Matter Science, RIKEN, Wako, Saitama, Japan3
Department of Physics, University of Basel, Basel, Switzerland4
We characterize a single-spin manipulation scheme realized through the singlet-triplet anticrossing point induced by the slanting field of a micromagnet in GaAs double dot setups. We discuss the optimization of single-spin gates with suitable choices of detuning pulses and an improved geometry for the double-dot and micromagnet configuration. We examine the effect on this scheme of the Overhauser field induced by nuclear spins and of charge noise from the electric gates, and characterize the timescales and analytical forms of the resulting decay of coherence. Our results suggest that this scheme is a promising approach for the realization of fast single-spin operations.