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TY  - THES
AU  - Cerfontaine, Pascal
TI  - High-fidelity single- and two-qubit gates for two-electron spin qubits
PB  - RWTH Aachen University
VL  - Dissertation
CY  - Aachen
M1  - RWTH-2019-09348
SP  - 1 Online-Ressource (xiii, 166 Seiten) : Illustrationen, Diagramme
PY  - 2019
N1  - Veröffentlicht auf dem Publikationsserver der RWTH Aachen University
N1  - Dissertation, RWTH Aachen University, 2019
AB  - A key ingredient for fault-tolerant quantum computers are sufficiently accurate logic gates on single and multiple qubits in the presence of decohering noise. In this thesis, we theoretically develop and experimentally demonstrate such high-fidelity quantum gates for semiconductor-based quantum computing. Specifically, we consider a qubit encoded in the singlet and one triplet state of two electron spins in GaAs. While its potential for optical coupling makes GaAs an attractive material, highly auto-correlated magnetic field noise from fluctuating nuclear spins leads to considerably lower coherence times than for Si-based devices, where nuclear spins can be removed by isotopic purification. In addition to noise, the control methods used in earlier experiments are based on unrealistic approximations. For these reasons, fidelities well above 99 
LB  - PUB:(DE-HGF)11
DO  - DOI:10.18154/RWTH-2019-09348
UR  - https://publications.rwth-aachen.de/record/768380
ER  -