High-Fidelity Single-Qubit Gates for Two-Electron Spin Qubits in GaAs
  Single-qubit operations on singlet-triplet qubits in GaAs double quantum dots have not yet reached the fidelities required for fault-tolerant quantum information processing. Considering experimentally important constraints and using measured noise spectra, we numerically minimize the effect of decoherence (including high-frequency 1/f-like noise) and show theoretically that quantum gates with fidelities higher than 99.9% are achievable. We also present a self-consistent tuning protocol which should allow the elimination of individual systematic gate errors directly in an experiment. 
Pascal Cerfontaine, Tim Botzem, David P. DiVincenzo, Hendrik Bluhm
quant-ph