In the recent years, the continuous advancements in oxide thin films epitaxial growth and characterization techniques led to the possibility of design and control complex oxide heterointerfaces and characterize their crystal and electronic structure with atomic precision. These advancements brought to light a wealth of properties for oxide heterointerfaces and opened to new opportunities for oxide electronics and spintronics. Now the research on oxide interfaces is expanding outside the pure material science realm, entering the field of application-oriented devices. In this thesis, the innovative and intriguing functionalities arising in an oxide system where Rashba spin-orbit coupling, magnetism, superconductivity and high-mobility are combined in the same two dimensional electron gas (2DEG) have been reported. The focus of my work has two main aspects: on one side, to study the interplay between the several ground states in the 2DEG at the LaAlO3/EuTiO3/SrTiO3 interface; on the other, to realize nanodevices which will make these phenomena functional for new quantum electronics with advantages like scalability, easy top-down processing and possibility to manipulate the 2DEG system with unprecedented control.