Speaker: Valla Fatemi (Cornell) Title:Towards Mesoscopic Quantum Matter with Andreev Spin Arrays Abstract: Superconducting bosonic systems and semiconducting spin states are two leading solid-state platforms for multi-component quantum science, including quantum simulation and quantum computation. Each comes with distinct strengths and challenges. Hybrid structures made of both semiconductors and superconductors, such as Andreev spin states, aim to combine the best features of both platforms. To become competitive, however, the hybrid systems will need to overcome challenges at the materials level. Therefore, we are motivated to identify disruptive concepts that may be enabled by this hybrid platform. In this talk, we will describe our efforts on both fronts. First, we will discuss our experimental efforts to better benchmark Andreev spin properties and mitigate issues of spin readout and quasiparticle poisoning. Second, we will describe a concept for a few-spin array with constrained, always-on interactions. Analogous to a molecule of an Ising magnet, we motivate how this structure, operated largely at time-reversal symmetric bias conditions, can be a hardware-efficient logical qubit similar to Schrodinger cat qubits. We will conclude with an outlook for avenues for improvement of the materials and device concepts.