Towards ABS Spectroscopy of Multi-terminal Josephson Junctions on SAG PbTe Nanowires for Qubit Applications

Andreev spin qubits (ASQs) are a promising qubit platform based on semiconductor-superconductor hybrid nanowire Josephson junctions. These qubits are formed from the spin states of an individual quasiparticle trapped in the Andreev levels of a two-terminal semiconductor Josephson junction with spin-orbit interaction. Recently, three-terminal ASQ devices have been proposed to outperform two-terminal ones due to enhanced spin splitting of the Andreev bound states (ABS). The realization of such devices relies on creating multi-terminal Josephson junctions with non-classical multi-terminal couplings and independent phase control, where only a few quantum modes are populated. We present our progress towards meeting these key requirements in a three-terminal Josephson junction fabricated on selective-area-grown (SAG) PbTe nanowires.