Testing Realism for Mesoscopic Systems

The motivation of this thesis is to develop an understanding of the quantum nature of mesoscopic and macroscopic quantum systems. We are interested in quantum properties such as entanglement, Bell-nonlocality, and violations of different forms of realism, including Leggett-Garg macro-realism. These quantum properties allow the falsification of whole classes of classical theories. Additionally, they provide a foundation for developing quantum technologies. In this thesis, we aim to give predictions of the quantum features in systems which act as quantum simulators of other inaccessible systems. We are also interested in understanding entanglement and macro-realism violations in systems that simulate the early universe.