Optimal Designs of Spin- and Majorana Qubit Devices
Sathish Kumar Kuppuswamy (TU Delft - Applied Sciences)
L.M.K. Vandersypen – Promotor (TU Delft - QCD/Vandersypen Lab, TU Delft - Applied Sciences)
A.R. Akhmerov – Promotor (TU Delft - Applied Sciences)
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Abstract
This thesis explores pathways to scalable, fault-tolerant quantum computing by focusing on two leading qubit platforms—spin qubits and Majorana qubits—and developing simulation-based methods to speed up their design and optimization. Spin qubits utilize advanced semiconductor fabrication but remain susceptible to decoherence from charge noise and environmental disturbances, while Majorana qubits offer intrinsic topological protection through non-Abelian quasiparticles yet face significant experimental challenges in initialization and braiding. To address these issues, the work introduces numerical modeling techniques and customized optimization frameworks to improve gate designs for spin qubit arrays and Majorana trijunctions, while systematically analyzing the effects of disorder and identifying operational regimes that support stable quantum behavior.