PhD defense: Filip K. Malinowski – University of Copenhagen

PhD defense: Filip K. Malinowski

Noise suppression and long-range exchange coupling for gallium arsenide spin qubits

In my thesis and the defense talk I describe several experimental results on spin qubits realized in GaAs gate-defined quantum dots. First, I describe how to suppress the charge noise by introducing additional symmetries in the quantum dot array. Second, I present the study of the nuclear noise spectrum and demonstrate how to filter out its high-frequency narrowband component. Third, I show the study of the ground state spin of the multielectron quantum dot by coupling it to the neighbouring electron. Last but not least, I demonstrate that the multielectron quantum dot can mediate exchange interaction between distant spins.