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.
JARA-Institute for Quantum Information, RWTH Aachen University, D-52074 Aachen, Germany.
Pascal
P
Cerfontaine
JARA-Institute for Quantum Information, RWTH Aachen University, D-52074 Aachen, Germany.
Tim
T
Botzem
JARA-Institute for Quantum Information, RWTH Aachen University, D-52074 Aachen, Germany and Peter Grünberg Institute: Theoretical Nanoelectronics, Research Center Jülich, D-52425 Jülich, Germany.
David P
DP
DiVincenzo
JARA-Institute for Quantum Information, RWTH Aachen University, D-52074 Aachen, Germany.
Hendrik
H
Bluhm