Crystal-phase defined nanowire quantum dots as a platform for qubits

This thesis aims to study InAs nanowires with built-in crystal-phase defined quantum dots as a platform for quantum computing. We investigate them as a platform for topological qubits, as well as charge and spin qubits. In a first step towards Majorana bound states we investigate the induced superconductivity in a nanowire hybrid device where the superconductor is deposited by standard e-beam evaporation without an epitaxial interface to the nanowire. Using the integrated tunnel barriers as spectrometer, we draw conclusions about the origin of quasiparticle poisoning in our system.
In a second approach we couple a nanowire double quantum dot to a high-impedance resonator. In a first step we will investigate the resonator-nanowire hybrid device as a charge qubit. We observe a very large qubit linewidth. To improve our system, we turn to spin qubits. We take advantage of the intrinsic spin-orbit coupling in our nanowires to couple the resonator to a singlet-triplet qubit, with which we demonstrate strong spin-photon coupling.